How to copy an Array ? | JavaScript Interview Question

[angshu]

I use 1 of 3 ways:




1: let b = [...a];
2 : let b = Object.values(a);
3 : let b = a.slice();

[UdayGhulaxe]

b = Object.assign([], a) will create empty array even if `a` is undefined,
but b = [...a] will throw an error.

[HiHi-qdoy]

your videos solve all my (JavaScript) problems :)

[abhijeetsoni]

It was really a good session. One more way that I can think of is 'slice()'. I can do like this:-
let b = a.slice(0);
Slice() is actually for deletion, but passing '0' as arg, it will do the trick. 🙂

[yogasound]

let a = [1, 2, 3, 4]
let b = a.slice()

[sogggy]

Great video. You do a great job explaining every step. More videos like this please.


Edit: just found your other channel that has more videos like this :)

[mdshoaibAlamgcetts]

Excellent initiative... thanks for covering such important topics now a days lot of questions come from oops in JavaScript

[mrzack]

Hi, I wanna thank u for showing us all those ways ! keep it up !

[mohsanabbas]

i can do with spread operator, with slice method
a=[1, 2, 3, 4, 5]
b=[...a]


b=a.slice(0, 5);

[sergey_is_sergey]

I would think the simplest method that's also backwards compatible (going waaay back) is: b = a.slice();

[princeroy]

Hi Sir i Liked your tutorials, can you please make tutorials on Searching and sorting

[Varunkumarmca]

can we use slice as well?


let arr = [3, 4, 3];
let newarr= arr.slice(arr);

console.log(newarr)

[RedEyedJedi]

The lack of spaces in your for loop upsets my ocd. Other than that, great lesson.

[irkfaisal]

if interviewer ask don't use any method even under loop ?

[sureshkumar-xdot]

Hi sir i watched your videos your explanation is very good .
can u explain different ways of create an object in javaScript ?

[jainshilpi]

sir I have one question -suppose I have a set of boxes suppose 5*5 (25 boxes) and when we have clicked on any box we need to display number on which box we have clicked on ?how to solve this?

[akalrove]

One note, for objects, spread operator or Object.assign copy references not clone the object.

[sasta_guitarist]

I was doing this.a = Object.assign([ ], this.b ); today, but noticed b was still changing on a.

So I tried with, this.a = which worked well

[Palalune]

Why not just do 

let b = [1, 2, 3, 4];

?

I'll show myself out ...

[AliNjaff]

how to copy 2 arrays in to 1 array i have an exam thanks for help