Populating another array from array - Javascript

Question

Very simple thing I am trying to do in JS (assign the values of one array to another), but somehow the array bar\'s value doesn\'t seem affected at all.

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Answer 1

You have misspelled variable ar Try this

for(i=0;i<ar.length;i++){
    bar[i]=ar[i];
}
alert(ar[1]);

Answer 2

The problem probably here in the for loop statement:

for(i=0;i<ar.length;i++){
    bar[i]=ar[i];
}
alert(ar[1]);

You need to fix to ar.length instead of arr.length. And it's better to initialize bar as: var bar = [].

Answer 3

In ES6 you can use Array.from:

var ar = ["apple","banana","canaple"];
var bar = Array.from(ar);
alert(bar[1]); // alerts 'banana'

Answer 4

In your code, the variable arr in the for loop is not the same as your original array ar: you have one too many r.

Answer 5

Your code isn't working because you are not initializing bar:

var bar = [];

You also forgot to declare your i variable, which can be problematic, for example if the code is inside a function, i will end up being a global variable (always use var :).

But, you can avoid the loop, simply by using the slice method to create a copy of your first array:

var arr = ["apple","banana","canaple"];
var bar = arr.slice();

Answer 6

With ES6+ you can simply do this

const original = [1, 2, 3];
const newArray = [...original];

The documentation for spread syntax is here

To check, run this small code on dev console

const k = [1, 2];
const l = k
k === l
> true
const m = [...k]
m
> [1, 2]
k === m
> false