How to iterate over an array skipping every second element?

Question

How to write this type of for loop in ruby?

for(i = 0; i < arr.length; i = i+2) {
}

I know how to write it if step is 1, but if step > 1, how to make it?

Answer 1

You can specify .step size as an argument actually:

(0...arr.length).step(2) { |i| puts arr[i] }

Answer 2

Another way is to use Array::each_slice:

 arr.each_slice(2) { |n| p n.first }