Multiply all even indexed integers by two
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You can also multiply alternate numbers by 2
a = 4408041234567901
1.arr = a.to_s.chars.map.with_index {|n,i| i.even? ? n.to_i * 2 : n.to_i }# => [8, 4, 0, 8, 0, 4, 2, 2, 6, 4, 10, 6, 14, 9, 0, 1]Improving a little bit, you can use a Hash to find the number to be multiplied.
2.h = {true => 2, false => 1} a.to_s.each_char.map.with_index {|n,i| n.to_i * h[i.even?]}3.coef = [2, 1].cycle
a.to_s.each_char.map { |v| v.to_i * coef.next }
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