How to pass &:key as an argument to map instead of a block with ruby?

Question

I wrote this code:

my.objects.map { |object| object.key }

My rubocop said:

Pass &:key as an argument to map instead of a block.

Is there a short way to do the same thing?

You can use `rubocop -a yourfile.rb` to let Rubocop auto-correct your code. — cremno, Jul 24 '15 at 09:48
@cremno add this comment as an answer .. I search for this many times but now I found it (y) thank you — HMagdy, Sep 07 '17 at 15:00

score 54 · Accepted Answer · answered Jul 24 '15 at 09:36

54

Pass &:key as an argument to map instead of a block

means:

my.objects.map(&:key)

answered Jul 24 '15 at 09:36

shivam

4

For people having any confusion, you can pass 'transformation function' like `to_i` or `to_s` instead of key. That is to say, it'll look something like below. `my.objects.map(&:to_i)` – darkdefender27 Jul 11 '18 at 05:59

1 Answers1