Web/JavaScript/Reference/Operators

This chapter documents all the JavaScript language operators, expressions and keywords.

Expressions and operators by category

For an alphabetical listing see the sidebar on the left.

Primary expressions

Basic keywords and general expressions in JavaScript.

this

The this keyword refers to a special property of an execution context.

function

The function keyword defines a function expression.

class

The class keyword defines a class expression.

function*

The function* keyword defines a generator function expression.

yield

Pause and resume a generator function.

yield*

Delegate to another generator function or iterable object.

async function

The async function defines an async function expression.

await

Pause and resume an async function and wait for the promise's resolution/rejection.

[]

Array initializer/literal syntax.

{}

Object initializer/literal syntax.

/ab+c/i

Regular expression literal syntax.

( )

Grouping operator.

Left-hand-side expressions

Left values are the destination of an assignment.

Property accessors

Member operators provide access to a property or method of an object (object.property and object["property"]).

new

The new operator creates an instance of a constructor.

new.target

In constructors, new.target refers to the constructor that was invoked by new.

import.meta

An object exposing context-specific metadata to a JavaScript module.

super

The super keyword calls the parent constructor.

...obj

Spread syntax allows an expression to be expanded in places where multiple arguments (for function calls) or multiple elements (for array literals) are expected.

Increment and decrement

Postfix/prefix increment and postfix/prefix decrement operators.

A++

Postfix increment operator.

A--

Postfix decrement operator.

++A

Prefix increment operator.

--A

Prefix decrement operator.

Unary operators

A unary operation is operation with only one operand.

delete

The delete operator deletes a property from an object.

void

The void operator discards an expression's return value.

typeof

The typeof operator determines the type of a given object.

+

The unary plus operator converts its operand to Number type.

-

The unary negation operator converts its operand to Number type and then negates it.

~

Bitwise NOT operator.

!

Logical NOT operator.

Arithmetic operators

Arithmetic operators take numerical values (either literals or variables) as their operands and return a single numerical value.

+

Addition operator.

-

Subtraction operator.

/

Division operator.

*

Multiplication operator.

%

Remainder operator.

**

Exponentiation operator.

Relational operators

A comparison operator compares its operands and returns a Boolean value based on whether the comparison is true.

in

The in operator determines whether an object has a given property.

instanceof

The instanceof operator determines whether an object is an instance of another object.

<

Less than operator.

>

Greater than operator.

<=

Less than or equal operator.

>=

Greater than or equal operator.

Note: => is not an operator, but the notation for Arrow functions.

Equality operators

The result of evaluating an equality operator is always of type Boolean based on whether the comparison is true.

==

Equality operator.

!=

Inequality operator.

===

Identity operator.

!==

Nonidentity operator.

Bitwise shift operators

Operations to shift all bits of the operand.

<<

Bitwise left shift operator.

>>

Bitwise right shift operator.

>>>

Bitwise unsigned right shift operator.

Binary bitwise operators

Bitwise operators treat their operands as a set of 32 bits (zeros and ones) and return standard JavaScript numerical values.

&

Bitwise AND.

|

Bitwise OR.

^

Bitwise XOR.

Binary logical operators

Logical operators are typically used with boolean (logical) values, and when they are, they return a boolean value.

&&

Logical AND.

||

Logical OR.

??

Nullish Coalescing Operator.

Conditional (ternary) operator

(condition ? ifTrue : ifFalse)

The conditional operator returns one of two values based on the logical value of the condition.

Optional Chaining operator

?.

The optional chaining operator returns undefined instead of causing an error if a reference is nullish (null or undefined).

Assignment operators

An assignment operator assigns a value to its left operand based on the value of its right operand.

=

Assignment operator.

*=

Multiplication assignment.

**=

Exponentiation assignment.

/=

Division assignment.

%=

Remainder assignment.

+=

Addition assignment.

-=

Subtraction assignment

<<=

Left shift assignment.

>>=

Right shift assignment.

>>>=

Unsigned right shift assignment.

&=

Bitwise AND assignment.

^=

Bitwise XOR assignment.

|=

Bitwise OR assignment.

&&=

Logical AND assignment.

||=

Logical OR assignment.

??=

Logical nullish assignment.

[a, b] = [1, 2] {a, b} = {a:1, b:2}

Destructuring assignment allows you to assign the properties of an array or object to variables using syntax that looks similar to array or object literals.

Comma operator

,

The comma operator allows multiple expressions to be evaluated in a single statement and returns the result of the last expression.

Specifications

Specification

ECMAScript (ECMA-262)The definition of 'ECMAScript Language: Expressions' in that specification.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
Addition (+)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Addition assignment (x += y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Assignment (x = y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
async function expression	Chrome Full support 55	Edge Full support 15	Firefox Full support 52	IE No support No	Opera Full support 42	Safari Full support 10.1	WebView Android Full support 55	Chrome Android Full support 55	Firefox Android Full support 52	Opera Android Full support 42	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0	nodejs Full support 7.6.0 Full support 7.6.0 Full support 7.0.0 Disabled' Disabled' From version 7.0.0: this feature is behind the --harmony runtime flag.
await	Chrome Full support 55	Edge Full support 14	Firefox Full support 52	IE No support No	Opera Full support 42	Safari Full support 10.1	WebView Android Full support 55	Chrome Android Full support 55	Firefox Android Full support 52	Opera Android Full support 42	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0	nodejs Full support 7.6.0 Full support 7.6.0 Full support 7.0.0 Disabled' Disabled' From version 7.0.0: this feature is behind the --harmony runtime flag.
Bitwise AND (a & b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise AND assignment (x &= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise NOT (~a)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise OR (a | b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise OR assignment (x |= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise XOR (a ^ b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise XOR assignment (x ^= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
class	Chrome Full support 42	Edge Full support 13	Firefox Full support 45	IE No support No	Opera Full support 29	Safari Full support 7	WebView Android Full support 42	Chrome Android Full support 42	Firefox Android Full support 45	Opera Android Full support 29	Safari iOS Full support 7	Samsung Internet Android Full support 4.0	nodejs Full support 6.0.0 Full support 6.0.0 Full support 5.0.0 Disabled' Disabled' From version 5.0.0: this feature is behind the --harmony runtime flag.
Comma operator	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Conditional operator (c ? t : f)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Decrement (--)	Chrome Full support 2	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 4	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 3.2	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
delete	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 4	Opera Full support 9	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Destructuring assignment	Chrome Full support 49	Edge Full support 14	Firefox Full support 41 Notes' Full support 41 Notes' Notes' Firefox provided a non-standard destructuring implementation from Firefox 2 to 40.	IE No support No	Opera Full support 36	Safari Full support 8	WebView Android Full support 49	Chrome Android Full support 49	Firefox Android Full support 41 Notes' Full support 41 Notes' Notes' Firefox provided a non-standard destructuring implementation from Firefox 2 to 40.	Opera Android Full support 36	Safari iOS Full support 8	Samsung Internet Android Full support 5.0	nodejs Full support 6.0.0
Division (/)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Division assignment (x /= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Equality (a == b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Exponentiation (**)	Chrome Full support 52	Edge Full support 14	Firefox Full support 52	IE No support No	Opera Full support 39	Safari Full support 10.1	WebView Android Full support 51	Chrome Android Full support 52	Firefox Android Full support 52	Opera Android Full support 41	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0	nodejs Full support 7.0.0 Full support 7.0.0 Full support 6.5.0 Disabled' Disabled' From version 6.5.0: this feature is behind the --harmony runtime flag.
Exponentiation assignment (x **= y)	Chrome Full support 52	Edge Full support 14	Firefox Full support 52	IE No support No	Opera Full support 39	Safari Full support 10.1	WebView Android Full support 51	Chrome Android Full support 52	Firefox Android Full support 52	Opera Android Full support 41	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0	nodejs Full support 7.0.0 Full support 7.0.0 Full support 6.5.0 Disabled' Disabled' From version 6.5.0: this feature is behind the --harmony runtime flag.
function	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
function*	Chrome Full support 49	Edge Full support 12	Firefox Full support 26	IE No support No	Opera Full support 36	Safari Full support 10	WebView Android Full support 49	Chrome Android Full support 49	Firefox Android Full support 26	Opera Android Full support 36	Safari iOS Full support 10	Samsung Internet Android Full support 5.0	nodejs Full support 4.0.0
Greater than (a > b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Greater than or equal (a >= b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Grouping operator ()	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
in	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 5.5	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Increment (++)	Chrome Full support 2	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 4	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 3.2	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Inequality (a != b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
instanceof	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 5	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise left shift (a << b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Left shift assignment (x <<= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Less than (a < b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Less than or equal (a <= b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Logical AND (&&)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Logical AND assignment (x &&= y)	Chrome Full support 85	Edge Full support 85	Firefox Full support 79	IE No support No	Opera No support No	Safari Full support 14	WebView Android Full support 85	Chrome Android Full support 85	Firefox Android Full support 79	Opera Android No support No	Safari iOS Full support 14	Samsung Internet Android No support No	nodejs Full support 15.0.0
Logical NOT (!)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Logical nullish assignment (x ??= y)	Chrome Full support 85	Edge Full support 85	Firefox Full support 79	IE No support No	Opera No support No	Safari Full support 14	WebView Android Full support 85	Chrome Android Full support 85	Firefox Android Full support 79	Opera Android No support No	Safari iOS Full support 14	Samsung Internet Android No support No	nodejs Full support 15.0.0
Logical OR (	)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Logical OR assignment (x	= y)	Chrome Full support 85	Edge Full support 85	Firefox Full support 79	IE No support No	Opera No support No	Safari Full support 14	WebView Android Full support 85	Chrome Android Full support 85	Firefox Android Full support 79	Opera Android No support No	Safari iOS Full support 14	Samsung Internet Android No support No	nodejs Full support 15.0.0
Multiplication (*)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Multiplication assignment (x *= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
new	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
new.target	Chrome Full support 46	Edge Full support 13	Firefox Full support 41	IE No support No	Opera Full support 33	Safari Full support 11	WebView Android Full support 46	Chrome Android Full support 46	Firefox Android Full support 41	Opera Android Full support 33	Safari iOS Full support 11	Samsung Internet Android Full support 5.0	nodejs Full support 5.0.0
Nullish coalescing operator (??)	Chrome Full support 80	Edge Full support 80	Firefox Full support 72	IE No support No	Opera Full support 67	Safari Full support 13.1	WebView Android Full support 80	Chrome Android Full support 80	Firefox Android No support No	Opera Android No support No	Safari iOS Full support 13.4	Samsung Internet Android No support No	nodejs Full support 14.0.0
Object initializer	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 1	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Optional chaining operator (?.)	Chrome Full support 80 Full support 80 Full support 79 Disabled' Disabled' From version 79: this feature is behind the Experimental JavaScript preference (needs to be set to true). To change preferences in Chrome, visit chrome://flags.	Edge Full support 80 Full support 80 Full support 79 Disabled' Disabled' From version 79: this feature is behind the Experimental JavaScript preference (needs to be set to true).	Firefox Full support 74	IE No support No	Opera Full support 67 Full support 67 Full support 66 Disabled' Disabled' From version 66: this feature is behind the Experimental JavaScript preference (needs to be set to true).	Safari Full support 13.1	WebView Android Full support 80	Chrome Android Full support 80 Full support 80 Full support 79 Disabled' Disabled' From version 79: this feature is behind the Experimental JavaScript preference (needs to be set to true). To change preferences in Chrome, visit chrome://flags.	Firefox Android No support No	Opera Android No support No	Safari iOS Full support 13.4	Samsung Internet Android No support No	nodejs Full support 14.0.0
Pipeline operator (|>) Experimental'	Chrome No support No	Edge No support No	Firefox No support No	IE No support No	Opera No support No	Safari No support No	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support No	nodejs No support No
Property accessors	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Remainder (%)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Remainder assignment (x %= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise right shift (a >> b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Right shift assignment (x >>= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Strict equality (a === b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 4	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Strict inequality (a !== b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 4	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Subtraction (-)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Subtraction assignment (x -= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
super	Chrome Full support 42	Edge Full support 13	Firefox Full support 45	IE No support No	Opera Full support 29	Safari Full support 7	WebView Android Full support 42	Chrome Android Full support 42	Firefox Android Full support 45	Opera Android Full support 29	Safari iOS Full support 7	Samsung Internet Android Full support 4.0	nodejs Full support 6.0.0
this	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 4	Opera Full support 9.5	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
typeof	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Unary negation (-)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Unary plus (+)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 4	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Bitwise unsigned right shift (a >>> b)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
Unsigned right shift assignment (x >>>= y)	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 3	Opera Full support 3	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
void	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 5	Opera Full support 4	Safari Full support 3.2	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 3	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100
yield	Chrome Full support 39	Edge Full support 12	Firefox Full support 26 Notes' Full support 26 Notes' Notes' Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification. Notes' Starting with Firefox 29, an IteratorResult object returned for completed generator function.	IE No support No	Opera Full support 26	Safari Full support 10	WebView Android Full support 39	Chrome Android Full support 39	Firefox Android Full support 26 Notes' Full support 26 Notes' Notes' Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification. Notes' Starting with Firefox 29, an IteratorResult object returned for completed generator function.	Opera Android Full support 26	Safari iOS Full support 10	Samsung Internet Android Full support 4.0	nodejs Full support 4.0.0 Full support 4.0.0 Full support 0.12 Disabled' Disabled' From version 0.12: this feature is behind the --harmony runtime flag.
yield*	Chrome Full support 39	Edge Full support 12	Firefox Full support 27 Notes' Full support 27 Notes' Notes' Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.	IE No support No	Opera Full support 26	Safari Full support 10	WebView Android Full support 39	Chrome Android Full support 39	Firefox Android Full support 27 Notes' Full support 27 Notes' Notes' Starting with Firefox 33, the parsing of the yield expression has been updated to conform with the ES2015 specification.	Opera Android Full support 26	Safari iOS Full support 10	Samsung Internet Android Full support 4.0	nodejs Full support 4.0.0 Full support 4.0.0 Full support 0.12 Disabled' Disabled' From version 0.12: this feature is behind the --harmony runtime flag.

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

See implementation notes.'

See implementation notes.

User must explicitly enable this feature.'

User must explicitly enable this feature.

See also

• Operator precedence

Expressions and operators by Mozilla Contributors is licensed under CC-BY-SA 2.5.