What's the 'Ruby way' to iterate over two arrays at once

Question

More of a syntax curiosity than a problem to solve...

I have two arrays of equal length, and want to iterate over them both at once - for example, to output both the

Answer 1

Simply zipping the two arrays together works well if you are dealing with arrays. But what if you are dealing with never-ending enumerators, such as something like these:

enum1 = (1..5).cycle
enum2 = (10..12).cycle

enum1.zip(enum2) fails because zip tries to evaluate all the elements and combine them. Instead, do this:

enum1.lazy.zip(enum2)

That one lazy saves you by making the resulting enumerator lazy-evaluate.