CODEWITHSUNDEEP
rubyarrays
squiguy
squiguy

Reputation: 33380

Flip array in chunks

I need to reverse an array in chunks of a specified size. Here is an example of what needs to happen:

chunk = 2
arr = [1,2,3,4,5]

How can I build an array in which chunks are reversed like this:

[2, 1, 4, 3, 5]

My code:

arr.each_slice(chunk) { |a| p a }

outputs:

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

Each of the chunks above needs to be reversed and appended to a final array as seen above.

Upvotes: 0

Views: 119

Answers (1)

Arup Rakshit
Arup Rakshit

Reputation: 118289

arr = [1,2,3,4,5]
arr.each_slice(2).flat_map(&:reverse)
# => [2, 1, 4, 3, 5]

Upvotes: 2

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