Modify an array and push to form another array

Question

What is a better way than this:

X = %w(a b c)
Y = %w()
  X.each do |x|
    Y << "good_" + x
  end

Thanks.

Jake Dempsey · Accepted Answer · 2012-10-25 14:56:45Z

6

%w(a b c).map{|x| "good_#{x}"}

answered Oct 25, 2012 at 14:56

Jake Dempsey

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Comments

Shadwell · Accepted Answer · 2012-10-25 15:21:08Z

3

collect method on array will do

Y = X.collect{|e|'good_'+e}

OR

directly

Y = %w(a b c).collect{|e|'good_'+e}

Shadwell

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answered Oct 25, 2012 at 14:48

Rubyman

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user904990 · Accepted Answer · 2012-10-25 18:27:21Z

1

to have them both defined on same line:

y = ( x = %w[a b c] ).map { |i| 'good_%s' % i }

y
=> ["good_a", "good_b", "good_c"]

x
=> ["a", "b", "c"]

answered Oct 25, 2012 at 18:27

user904990