V.map(&:to_s)

Rails
1

How &: works? if it is a method, and where is it defined?
It is rails addition to ruby obviously.

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2

Eric Archangel wrote:

How &: works? if it is a method, and where is it defined?
It is rails addition to ruby obviously.

http://caboo.se/doc/classes/Symbol.html#M003931

Symbol#to_proc

This is tricky thing to document. It exploits a ruby syntax quirk where
prepending a & to a method argument calls “to_proc” on that object in an
attempt to make it eligible to be a block.

v.map(&:to_s)

Is the same as:

v.map { |i| i.to_s }