Array.push() with Objects

Question

Is there any reason why I canot .push() objects into an Array? Simplified example below.

let myArray = [{x:1},{x:2}];

let myObj = {x:1};

let x = myArray.push(myObj);

console.log(x)

// I'am expecting [{x:1},{x:2},{x:1}] but I get 3

Array#push returns the new length of the array, which you assign to x. Try console.log(myArray) — Ori Drori
– Ori Drori, Commented Oct 19, 2017 at 16:49
you need to console.log(myArray) to get what you are expecting. — user3880179
– user3880179, Commented Oct 19, 2017 at 16:51

Quentin · Accepted Answer · 2017-10-19 16:50:09Z

3

The return value of push is the length of the modified array. It isn't another reference to the same array, nor is it a new array.

If you want to log the array, then console.log(myArray) instead of x.

answered Oct 19, 2017 at 16:50

Quentin

949k136 gold badges1.3k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

fivetentaylor · Accepted Answer · 2017-10-19 16:50:06Z

1

Simple, push just returns the length of the new array and the array was modified in place. Try:

console.log(myArray)

answered Oct 19, 2017 at 16:50

fivetentaylor

1,2978 silver badges12 bronze badges

Comments

Dhananjayan · Accepted Answer · 2017-10-19 16:56:28Z

1

myArray.push(myObj) returns a number of objects it has. you are displaying the array length. If we print myArray you could see the array of Object.

answered Oct 19, 2017 at 16:56

Dhananjayan

5826 silver badges23 bronze badges

Comments

Sajeetharan · Accepted Answer · 2017-10-19 16:50:26Z

0

You should console.log(myArray); The way you do returns the new length of the array, which you assign another reference

DEMO

let myArray = [{x:1},{x:2}];
let myObj = {x:1};
console.log(myArray);
myArray.push(myObj);

console.log(myArray);

answered Oct 19, 2017 at 16:50

Sajeetharan

223k65 gold badges370 silver badges409 bronze badges

Comments

Bilal Djaghout · Accepted Answer · 2017-10-19 16:52:35Z

0

Array.push() function is working properly, and it returns the new length of the array

The push() method adds one or more elements to the end of an array and returns the new length of the array.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push?v=a

answered Oct 19, 2017 at 16:52

Bilal Djaghout

1863 silver badges14 bronze badges

Collectives™ on Stack Overflow

Array.push() with Objects

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related