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rubyblockproc

Can I use '&' shorthand for selecting matches?

I have this code:

result=
["MA-1", "NY-2", "CT-2", "NJ-1", "NJ-2", "NJ-3"].select do |element|
  element.match '2'
end

Is there a way to use the & shortcut without using a separate proc?

I tried:

["MA-1", "NY-2", "CT-2", "NJ-1", "NJ-2", "NJ-3"].select(&:match('2'))

which raises a syntax error.

Solution

  • It seems like you can use grep:

    ["MA-1", "NY-2", "CT-2", "NJ-1", "NJ-2", "NJ-3"].grep(/2/)
#=> ["NY-2", "CT-2", "NJ-2"]

    Or with the custom proc:

    my_proc = ->(e) { e.match('2') }
["MA-1", "NY-2", "CT-2", "NJ-1", "NJ-2", "NJ-3"].select(&my_proc)
#=> ["NY-2", "CT-2", "NJ-2"]

    Or (credits to @engineersmnky):

    select(&/2/.method(:match))