CODEWITHSUNDEEP
ruby
David Parks
David Parks

Reputation: 32051

How to return true/false in a block in ruby

I'm doing something like this:

myarray.delete_if{ |x|
   #some code
   case x
   when "something"
       return true
   when "something else"
       return false
   end

The "return" statement seems wrong, and I can't figure out the right syntax, I understand the simplistic form of: myarray.delete_if{ |x| x == y }, but not when my desire to return true/false is more procedural as in the case statement example.

Upvotes: 3

Views: 2346

Answers (2)

sawa
sawa

Reputation: 168081

You do not need to particularly condition the false cases. They can be nil by default if you do not condition them.

myarray.delete_if do |x|
  ...
  case x
  when "something" then true
  end
end

or even better:

myarray.delete_if do |x|
  ...
  "something" === x
end

I do not know what you have in the ... part, but if you just want to remove a certain element from an array, you can do:

myarray.delete("something")

and if you want to get back the receiver, then:

myarray.tap{|a| a.delete("something")}

Upvotes: 1

falsetru
falsetru

Reputation: 368944

Just remove return. In Ruby, the last value evaluated is used as return value.

myarray = ["something", "something else", "something"]
myarray.delete_if { |x|
  #some code
  case x
  when "something"
    true
  when "something else"
    false
  end
}
myarray # => ["something else"]

You can use next if you want to be explicit.

Upvotes: 6

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