Shorter way to pass every element of an array to a function

Question

In Ruby, you can apply a map function to every element of an array:

@files.map { |f| f.read) }

For which there is the syntactic sugar:

@files.map(&:read)

Is there any equivalent for

@files.map { |f| read(f) }

That is terser, similar to the above?

It is not syntax sugar. It is just how `Symbol#to_proc` works. — sawa, Dec 12 '12 at 08:12

score 27 · Accepted Answer · edited May 23 '17 at 11:51

27

You can do this

@files.map(&method(:read))

But be aware though about performance.

edited May 23 '17 at 11:51

Community

answered Dec 12 '12 at 07:27

oldergod

7

To me, it isn't shorter at all. Just more complicated and less performant :) – Sergio Tulentsev Dec 12 '12 at 07:46
@SergioTulentsev Why would it be more complicated ? – oldergod Dec 12 '12 at 07:54
1

It uses more chars, for one thing :) – Sergio Tulentsev Dec 12 '12 at 07:57
I agree it's more complicated, but I'm accepting since it's the logical equivalent of the first idiom. – user2398029 Dec 12 '12 at 08:08

1 Answers1