Implementing Set#to_proc and Hash#to_proc in Ruby(mudge.name)

28 pointsby mudgemeistervor 12 Jahren2 comments

Implementing Set#to_proc and Hash#to_proc in Ruby

http://mudge.name/2014/11/26/data-structures-as-functions.html

1 comments

FYI - the ampersand syntax is only in function calls, so the following will fail:

    &set.call(1)

Whereas this will not:

    (1..30).select(&set)

Generally speaking, & is syntactic sugar for .to_proc, but only within function calls.

byrootvor 12 Jahren

> & is syntactic sugar for .to_proc, but only within function calls

It's not exactly that. & is the syntax to pass a variable as a block to a method. And ruby will implicitly call to_proc on the object it receive as a block.

I know it seems pedantic, but there is a difference.