Remove n elements from array dynamically and add to another array

Question

nums= [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30]
new_array=[]

How do I grab every two items divisible by 5 and add them to a new array. This is the desired result: the new_array should now contain these values

      [[5,10],[15,20],[25,30]]

Note: I want to do this without pushing them all into the array and then performing array.each_slice(2). The process should happen dynamically.

akuhn · Accepted Answer · 2017-01-28 23:23:37Z

2

Try this

new_array = nums.select { |x| x % 5 == 0 }.each_slice(2).entries

No push involved.

answered Jan 28, 2017 at 23:23

akuhn

27.9k2 gold badges79 silver badges93 bronze badges

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

5 Comments

olafsadventures Over a year ago

Is there any way to do it w/o each slice?

akuhn Over a year ago

Why do you want to avoid each_slice?

olafsadventures Over a year ago

Because I am going to try the same thing only this time using hash keys and values... Just wondering.

akuhn Over a year ago

Hash supports each_slice too, just give it a try.

Cary Swoveland Over a year ago

I wasn't aware of Enumerable#entries. I see it's the same thing as Enumerable#to_a. Olaf, one way to avoid using Enumerable#each_slice here is the following: nums.select { |x| x % 10 == 0 }.map { |n| [n-5, n] }.

Collectives™ on Stack Overflow

Remove n elements from array dynamically and add to another array

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related