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15.3.11 Ruby Format Strings
Ruby format strings are described in the documentation of the Ruby
functions format
and sprintf
, in
https://ruby-doc.org/core-2.7.1/Kernel.html#method-i-sprintf.
There are two kinds of format strings in Ruby:
- Those that take a list of arguments without names. They support argument reordering by use of the
%n$
syntax. Note that if one argument uses this syntax, all must use this syntax. - Those that take a hash table, containing named arguments. The syntax is
%<name>
. Note that%{name}
is equivalent to%<name>s
.