How to use the spread operator In Javascript
Another approach to get the first N number of elements from an array in JavaScript is by using the spread operator along with array destructuring. This method creates a shallow copy of the original array with the specified number of elements.
Syntax:
const newArray = [...array.slice(0, n)];
Example:
const arr = [1, 2, 3, 4, 5, 6];
const n = 4;
const newArray = [...arr.slice(0, n)];
console.log(newArray);
Output
[ 1, 2, 3, 4 ]
Getting the first N elements from an array can be done using various methods in JavaScript. Whether you prefer built-in methods like slice() or third-party libraries like Lodash, each approach offers unique benefits. Understanding these methods enhances your ability to handle arrays effectively in different scenarios.
How to Get First N Elements from an Array in JavaScript ?
To get the first N elements from an array is a common task in JavaScript. Whether you’re dealing with lists of data, subsets of results, or pagination, this guide will provide you with several efficient methods to achieve this.
Below are the approaches to get the first N number of elements from an array in JavaScript.
Table of Content
- 1. Using the slice() method
- 2. Using a for loop
- 3. Using the splice() method
- 4. Using the filter() method
- 5. Using Lodash _.take() Method
- 6. Using the spread operator
Examples:
Input:
arr = [1, 2, 3, 4, 5, 6], n = 3
Output: [1, 2, 3]
Input:
arr = [6, 1, 4, 9, 3, 5, 7], n = 4
Output: [6, 1, 4, 9]
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