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havenwood/each_and_map.rb Secret

Last active August 29, 2015 14:14
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Each & Map (IRC)
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each_and_map.rb
array = [1, 2, 3]
#=> [1, 2, 3]
array.each { |n| n + 2 }
#=> [1, 2, 3]
array
#=> [1, 2, 3]
new_array = []
#=> []
array.each { |n| new_array << n + 2 }
#=> [1, 2, 3]
array
#=> [1, 2, 3]
new_array
#=> [3, 4, 5]
array.each { |n| new_array << n + 2 }
#=> [1, 2, 3]
array
#=> [1, 2, 3]
new_array
#=> [3, 4, 5, 3, 4, 5]
array.map { |n| n + 2 }
#=> [3, 4, 5]
array
#=> [1, 2, 3]
array.map! { |n| n + 2 }
#=> [3, 4, 5]
array
#=> [3, 4, 5]
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