describe "Array#collect" do
  it "returns a copy of array with each element replaced by the value returned by block" do
    a = ['a', 'b', 'c', 'd']
    b = a.collect { |i| i + '!'}
    b.should == ['a!', 'b!', 'c!', 'd!']
    # a.object_id.should_not == a.object_id
  end
  
  it "does not change self" do
    a = ['a', 'b', 'c', 'd']
    b = a.collect { |i| i + '!' }
    a.should == ['a', 'b', 'c', 'd']
  end
  
  it "returns the evaluated value of the block if it broke in the block" do
    a = ['a', 'b', 'c', 'd']
    b = a.collect do |i|
      if i == 'c'
        break 0
      else
        i + '!'
      end
    end
    b.should == 0
  end  
end