I need to turn an array of integers like [1,2,3]
into an array in which the integers are each followed by a zero: [1,0,2,0,3,0]
.
My best guess, which works but looks jenky:
> [1,2,3].flat_map{|i| [i,0]} => [1,0,2,0,3,0]
While Array#zip
works pretty well, one might avoid the pre-creation of zeroes array by using Array#product
:
[1,2,3].product([0]).flatten
or, just use a reducer:
[1,2,3].each_with_object([]) { |e, acc| acc << e << 0 }