Array push with key javascript

Question

Objects and Arrays are simple to understand data structures. However, everyday is a new learning day. Today, came across this situation where I wanted to use the push method on array to push key, value pair. The solution was very interesting and worth documenting.

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Push an Object to an Array in JavaScript #
Further Reading #
Definition and Usage
Return Value
More Examples
Browser Support
How do you push an object with a key in an array?
How do you push a key and value in an array?
How can I add a key
What does array push () do?


// Below is the desired JSON output that we wanted to have.

"desiredArray" : [
  "ourKey" : "ourValue"
];

Create an empty object
Use this object to insert your key and value
Push the object into the desired array


var tempObj = {};
tempObj[ourKey] = ourValue;
desiredArray.push(obj);

Push an Object to an Array in JavaScript #

To push an object into an array, call the push() method, passing it the object as a parameter. For example, arr.push({name: 'Tom'}) pushes the object into the array. The push method adds one or more elements to the end of the array.

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let arr = [];

const obj = {name: 'Tom'};

arr.push(obj);

console.log(arr); // 👉️ [{name: 'Tom'}]

We used the Array.push method to push an object into an array.

The object gets pushed to the end of the array.

If you only have the values that the object should contain, create the object before pushing it into the array.

Copied!
let arr = [];

const obj = {};
const name = 'Tom';

obj['name'] = name;

arr.push(obj);

console.log(arr); // 👉️ [{name: 'Tom'}]

We can use bracket notation to add one or more key-value pairs to the object.

Once the key-value pairs are assigned to the object, use the push method to add the object to the end of the array.

The same approach can be used to push multiple objects to an array.

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const arr = [];

const obj1 = {name: 'Alice'};
const obj2 = {name: 'Bob'};
const obj3 = {name: 'Carl'};

arr.push(obj1, obj2, obj3);

// 👇️ [{name: 'Alice'}, {name: 'Bob'}, {name: 'Carl'}]
console.log(arr);

The Array.push() method takes one or more values and pushes them to the array.

This enables us to pass multiple, comma-separated objects as arguments in the call to push().

Definition and Usage

The push() method adds new items to the end of an array.

The push() method changes the length of the array.

The push() method returns the new length.

Syntax

array.push(item1, item2, ..., itemX)

Parameters

Parameters	Description
item1 item2 .. itemX	The item(s) to add to the array. Minimum one item is required.

Return Value

Type	Description
A number	The new length of the array.

More Examples

Add 3 items to the array:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Kiwi", "Lemon", "Pineapple");

Try it Yourself »

push() returns the new length:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Kiwi");

Try it Yourself »

Browser Support

push is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	IE	Edge	Firefox	Safari	Opera
Yes	Yes	Yes	Yes	Yes	Yes

How do you push an object with a key in an array?

To push an object into an array, call the push() method, passing it the object as a parameter. For example, arr. push({name: 'Tom'}) pushes the object into the array. The push method adds one or more elements to the end of the array.

How do you push a key and value in an array?

Answer: Use the Square Bracket [] Syntax php // Sample array $array = array("a" => "Apple", "b" => "Ball", "c" => "Cat"); // Adding key-value pairs to an array $array["d"] = "Dog"; $array["e"] = "Elephant"; print_r($array); ?>

How can I add a key

To add a key/value pair to all objects in an array: On each iteration, use dot notation to add a key/value pair to the current object. The key/value pair will get added to all objects in the array.

What does array push () do?

Array.prototype.push() The push() method adds one or more elements to the end of an array and returns the new length of the array.

kode javascript Array push JavaScript Array add JavaScript Object push JavaScript

Array push with key javascript

Push an Object to an Array in JavaScript #

Further Reading #

Examples

Definition and Usage

Syntax

Parameters

Return Value

More Examples

Browser Support

How do you push an object with a key in an array?

How do you push a key and value in an array?

How can I add a key

What does array push () do?

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