I want sub array from an array by neglecting the last two of its indexes (With out looping)

Question

data=[];
r=[1,2,3,4,5,6,7,8,9];
data.push(r.splice(7,1));

At the end I don't need the 8,9, I need

data=[1,2,3,4,5,6,7]

Possible duplicate of [How to get subarray from array?](https://stackoverflow.com/questions/7538519/how-to-get-subarray-from-array) — xskxzr, May 06 '18 at 03:47

score 2 · Answer 1 · edited May 05 '18 at 14:06

2

You can just shallow copy with slice:

r = [1,2,3,4,5,6,7,8,9]
data = r.slice(0,-2)

Example:

var r = [1,2,3,4,5,6,7,8,9];
var data = r.slice(0,-2);
console.log(data);

edited May 05 '18 at 14:06

T.J. Crowder

answered May 05 '18 at 14:05

Which still uses a loop (it's unavoidable), it's just buried in `slice`. – T.J. Crowder May 05 '18 at 14:07
Internally, it uses loop but I think OP is referring to avoid using explicit loop. – Bhojendra Rauniyar May 05 '18 at 14:10
1

Probably. But just flagged it up in case they thought magic was involved. :-D – T.J. Crowder May 05 '18 at 14:18

score 0 · Answer 2 · answered May 05 '18 at 14:06

0

Use slice

var r = [1, 2, 3, 4, 5, 6, 7, 8, 9];
let data = r.slice(0, 7);
console.log(data)

answered May 05 '18 at 14:06

brk

Always Sunny · Answer 3 · 2018-05-05T15:26:51.240

0

You can try like this way also, with r.length - 2 it just shorten your array length by 2 so here it is discarding last two elements.

r = [1, 2, 3, 4, 5, 6, 7, 8, 9];
r.length = r.length - 2;
console.log(r);

edited May 05 '18 at 15:26

answered May 05 '18 at 15:20

Always Sunny

3 Answers3