Apply method to each elements in array/enumerable Apply method to each elements in array/enumerable ruby ruby

Apply method to each elements in array/enumerable


This will work:

array.map!(&:to_s)


You can use map or map! respectively, the first will return a new list, the second will modify the list in-place:

>> array = [:one,:two,:three]=> [:one, :two, :three]>> array.map{ |x| x.to_s }=> ["one", "two", "three"]


It's worth noting that if you have an array of objects you want to pass individually into a method with a different caller, like this:

# erb<% strings = %w{ cat dog mouse rabbit } %><% strings.each do |string| %>  <%= t string %><% end %>

You can use the method method combined with block expansion behavior to simplify:

<%= strings.map(&method(:t)).join(' ') %>

If you're not familiar, what method does is encapsulates the method associated with the symbol passed to it in a Proc and returns it. The ampersand expands this Proc into a block, which gets passed to map quite nicely. The return of map is an array, and we probably want to format it a little more nicely, hence the join.

The caveat is that, like with Symbol#to_proc, you cannot pass arguments to the helper method.