If given two arrays with integer data how to move one element to other array and delete that element from where it was or vice versa

Question

 let a = [1,2,40,60]
let b = [50, 70, 80]

Suppose I want to move 40 from a to array b and delete it from a so I get

a = [1,2,60]
b=[50, 70, 80, 40]

Please help. Any suggestion is appreciated

Does this answer your question? [How can I remove a specific item from an array?](https://stackoverflow.com/questions/5767325/how-can-i-remove-a-specific-item-from-an-array) — luk2302, Sep 19 '22 at 11:25
@luk2302 This one complements your answer [How to append something to an array?](https://stackoverflow.com/q/351409/9681386) — Javito, Sep 19 '22 at 11:26

Dan Mullin · Answer 1 · 2022-09-19T15:06:42.057

1

You can do a simple splice to move the value:

b.push(a.splice(2, 1)[0])

This grabs the element you want from a, adds it to b, and removes it from a all at the same time.

Edit: As @malarres pointed out below, you can also concat the returned array:

b.concat(a.splice(2, 1))

edited Sep 19 '22 at 15:06

answered Sep 19 '22 at 11:53

Dan Mullin

a.splice is injecting an array inside the b array which we do not want – Vikash Sharma Sep 19 '22 at 12:08
Odd. Splice only returns the element removed. What does the code look like? – Dan Mullin Sep 19 '22 at 12:10
Updated my answer. – Dan Mullin Sep 19 '22 at 12:12
Good idea @DanMullin, `b.concat(a.splice(2,1))` would also work – malarres Sep 19 '22 at 12:17
Thanks @malarres. I’ll have to remember that one – Dan Mullin Sep 19 '22 at 12:19

1 Answers1