Double square brackets in Ruby
arrays, ruby, square-bracket
Solution
It is application of the method `[]` taking an array as the argument.
Since the OP did not make clear, we cannot tell what `charmap` is, but for example if it were a hash, then `charmap[[char, c = input.getc]]` would return the value in `charmap` that corresponds to the key `[char, input.getc]`.
Problem
Given the following code: ``` def map(char, charmap) unless map = charmap[[char]] unless map = charmap[[char, c = input.getc]] input.ungetc(c) if c map = '' end end map end ``` What is the double square brackets doing? Thanks