Using Ruby, how do I convert all array values to a given type?

Question

I need to convert fixnums to strings. My solution is:

arr.map {|a| a.to_s}

Is there a better way?

Your solution is about as clear (good) as it gets, IMHO.

maerics
– maerics

2010-11-30 23:07:07 +00:00
Commented Nov 30, 2010 at 23:07 — maerics
– maerics, Commented Nov 30, 2010 at 23:07

Wayne Conrad · Accepted Answer · 2010-12-01 00:24:35Z

44

arr.map(&:to_s)

This uses a spiffy new feature in Ruby >= 1.8.7, the "symbol to proc" shortcut, and is equivalent to the code in your question.

edited Dec 1, 2010 at 0:24

answered Nov 30, 2010 at 23:04

Wayne Conrad

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3 Comments

dslh Over a year ago

I hadn't seen this before. What is the operator called? Do you have a link to documentation for the feature?

Wayne Conrad Over a year ago

@hambend, Great questions. Answer amended.

Jörg W Mittag Over a year ago

BTW: while this was only added to the Ruby core library in 1.9 and backported to 1.8.7, it has been available in ActiveSupport, Facets and many other Ruby extension libraries for ages before that.

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