How to replace array elements with another given array elements?

Question

I want to make a function that completely override the original array.

function putDatainthis(arr) {
    //....some ways to get data
    arr = [data,data,data...]; //this just reassigns arr = to new array original that was passed as reference hasn't been modified.
}

//so right now only way i can think of is this:

function putDatainthis(arr) {
    var data = [3,4,6,2,6,1];
    arr.length=0;
    data.forEach(function(e){
      arr.push(e);
    });
}

but i want to know can it be improved or is there more native way.

basically i want replace function

Muhammad Umer
– Muhammad Umer

2015-09-07 16:15:21 +00:00
Commented Sep 7, 2015 at 16:15 — Muhammad Umer
– Muhammad Umer, Commented Sep 7, 2015 at 16:15

cнŝdk · Accepted Answer · 2015-09-07 17:47:17Z

3

The Array.prototype.splice() function is what you are looking for, this is your way to go:

function putDataInThis(arr) {
  var data = [3, 4, 6, 2, 6, 1];
  arr.length = 0;

  arr.splice(0, arr.length, data);
  return arr;
}

alert(putDataInThis(["h", "g"]).join(","));

Explantation:

In the following arr.splice(0, arr.length, data) statement, we used splice() function with the following parameters:

0 the beginning index for the replacement.
arr.length as the number of elements to replace.
And data is the list of new values to put in our array.

Read Array.splice( ): insert, remove, or replace array elements for further information.

edited Sep 7, 2015 at 17:47

answered Sep 7, 2015 at 16:40

cнŝdk

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Comments

Syam S · Accepted Answer · 2015-09-07 16:31:36Z

1

I think you could use jquery merge.

function putDatainthis(arr) {
    var data = [3,4,6,2,6,1];
    $.merge(arr, data);
}

answered Sep 7, 2015 at 16:31

Syam S

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1 Comment

Muhammad Umer Over a year ago

i will be using it in nodejs

Jakir Hossain · Accepted Answer · 2015-09-07 16:37:22Z

0

Try this way.

function putDatainthis(arr) {
    var data = [3,4,6,2,6,1];    
    var concat_array = data.concat(arr);
}

answered Sep 7, 2015 at 16:37

Jakir Hossain

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1 Comment

Muhammad Umer Over a year ago

arr has not changed in this example

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