Array Basics (The GNU Awk User’s Guide)

From Get docs

8.1 The Basics of Arrays

This section presents the basics: working with elements in arrays one at a time, and traversing all of the elements in an array.

Array Intro    Introduction to Arrays
Reference to Elements    How to examine one element of an array.
Assigning Elements    How to change an element of an array.
Array Example    Basic Example of an Array
Scanning an Array    A variation of the for statement. It loops through the indices of an array’s existing elements.
Controlling Scanning    Controlling the order in which arrays are scanned.