Overlapping equivalent of Array#slice

Question

Given this Ruby array:

[1, 2, 3, 4, 5]

What is the easiest way to iterate it like this?

[[1,2], [2,3], [3,4], [4,5]]

Or this?

[[1,2,3], [2,3,4], [3,4,5]]

This is one of the problems from exercism.io lol – compiledweird Dec 19 '14 at 21:15 — compiledweird, Dec 19 '14 at 21:15

score 21 · Accepted Answer · answered Feb 28 '13 at 21:31

21

each_cons (docs) does this. You just pass it the size of the chunks you want and it will yield them to the block you pass.

If you actually want the arrays, then you can of course chain this with to_a, for example

(1..5).each_cons(3).to_a

answered Feb 28 '13 at 21:31

Frederick Cheung

1

This is excellent, I didn't know about the #each_cons method... Got to love Ruby! – hwatkins Feb 28 '13 at 21:36
Right on! I thought i remembered i had seen it somewhere inside stdlib... 8P – Jostein Feb 28 '13 at 21:42
1

@hwatkins, Ruby's Enumerable is chock-full of goodness like this. – the Tin Man Feb 28 '13 at 22:43

1 Answers1