How can I compare array with same index and value

Asked Feb 13 '21 at 16:41

Active Feb 13 '21 at 16:41

Viewed 32 times

How can I compare this two array or check that if it is same index and same value

example: not equal

var a = [310,311,312];

var b = [312,311,310];

example: equal

var a = [310,311,312];

var b = [310,311,312];

Thank you in advance.

asked Feb 13 '21 at 16:41

jemz

1

Hopefully we'll soon get [`Array.prototype.equals`](https://stackoverflow.com/a/63590182) – CertainPerformance Feb 13 '21 at 16:42
1

Use `every`: `a.every((e,i)=>e==b[i])` – gorak Feb 13 '21 at 16:42
2

@gorak Also need to check lengths are identical. Also, don't use sloppy comparison - strict equality is better. Or, if NaN is a possible value (or 0 needs to be distinguished from -0), `Object.is` is better – CertainPerformance Feb 13 '21 at 16:44
You can also do strings comparison console.log(a.toString() === b.toString()) – Abhijeet Abnave Feb 13 '21 at 16:47
1

@AbhijeetAbnave when you do -0 to `toString()` it becomes `'0'`. `Object.is` is much better choice. – gorak Feb 13 '21 at 16:49
1

@gorak agree with your points, thanks for letting me know – Abhijeet Abnave Feb 13 '21 at 16:51

0 Answers0