Simple ruby array splitting

Question

I would like to split my array in the following way:

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

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

#each_slice and #combination are close to what I want but not quite.
How could I split my array as in the example?

Why the rush to select an answer. You don't want to see others? — Cary Swoveland
– Cary Swoveland, Commented Jan 17, 2019 at 18:52
The question is not clear. There are different logics (which would lead to different results given if parameters were changed) to create the output you want. — sawa
– sawa, Commented Jan 18, 2019 at 3:51

Tyl · Accepted Answer · 2019-01-17 18:29:35Z

6

[1,2,3,4,5].each_cons(3).to_a
#=> [[1, 2, 3], [2, 3, 4], [3, 4, 5]]

Check doc for each_cons.

answered Jan 17, 2019 at 18:29

Tyl

5,28213 gold badges29 silver badges37 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Sergio Tulentsev Over a year ago

@tadman: true that. I'm doing some Go now and I miss the Enumerable :)

tadman Over a year ago

I want to port Enumerable to everything for that reason.

Cary Swoveland Over a year ago

@tadman, Enumerable would be a nothing-burger without Enumerator. It's the latter that's most deserving of our praise. Yes?

iGian · Accepted Answer · 2019-01-17 20:08:55Z

1

Just for fun:

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

n = 3
(ary.size - n + 1).times.each_with_object([]) { |_, a|  a << ary.first(n); ary.rotate! }

#=> [[1, 2, 3], [2, 3, 4], [3, 4, 5]]

answered Jan 17, 2019 at 20:08

iGian

11.2k3 gold badges24 silver badges38 bronze badges

Collectives™ on Stack Overflow

Simple ruby array splitting

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related