What is the most efficient way to concatenate N arrays in JavaScript ?
Last Updated :
28 Jun, 2023
In this article, we will see how to concatenate N arrays in JavaScript. The efficient way to concatenate N arrays can depend on the number of arrays and the size of arrays.
To concatenate N arrays, we use the following methods:
We create the N arrays and then concatenate the array by using the push() method. In this, we also use the spread operator(…) which iterates over each of the values.
Javascript
const arr1 = [11, 12, 13];
const arr2 = [14, 15, 16];
arr1.push(...arr2);
console.log(arr1);
|
Output
[ 11, 12, 13, 14, 15, 16 ]
First, we will create N arrays and then apply the concat() method to concatenate N arrays. The concat() method is used to merge N arrays together. This method does not alter the original arrays and returns the new Array.
Example:
Javascript
const arr1 = [11, 12, 13],
arr2 = [14, 15, 16],
arr3 = [17, 18, 19],
arr4 = [1, 3, 7];
const arr = arr1.concat(arr2, arr3, arr4);
console.log(arr);
|
Output
[
11, 12, 13, 14, 15,
16, 17, 18, 19, 1,
3, 7
]
You can also use Spread Operator to concatenate N arrays. For this, first, we will create N arrays and then apply Spread Operator to concatenate N arrays.
Note: This method is faster and less memory intensive than the concat() method.
Example:
Javascript
const arr1 = [11, 12, 13],
arr2 = [14, 15, 16],
arr3 = [17, 18, 19],
arr4 = [1, 3, 7];
const arr = [...arr1, ...arr2, ...arr3, ...arr4];
console.log(arr);
|
Output
[
11, 12, 13, 14, 15,
16, 17, 18, 19, 1,
3, 7
]
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