Merging arrays is a common task in JavaScript development. Learn to combine multiple arrays into a single array. With several ways to achieve this, they each have their own use case and benefit. Straightforward ways of doing so involve using the concat method, the spread operator, or utility libraries like Lodash.
Snippets
Using concat Method
const array1 = [1, 2, 3];
const array2 = [4, 5, 6];
const mergedArray = array1.concat(array2);
console.log(mergedArray); // Output: [1, 2, 3, 4, 5, 6]
The concat method is a built-in JavaScript function that merges two or more arrays into a new array without modifying the original arrays.
Using the Spread Operator
const array1 = [1, 2, 3];
const array2 = [4, 5, 6];
const mergedArray = [...array1, ...array2];
console.log(mergedArray); // Output: [1, 2, 3, 4, 5, 6]
The spread operator (...) provides a concise and modern way to merge arrays by spreading the elements of each array into a new array.
Using Lodash _.concat
const _ = require('lodash');
const array1 = [1, 2, 3];
const array2 = [4, 5, 6];
const mergedArray = _.concat(array1, array2);
console.log(mergedArray); // Output: [1, 2, 3, 4, 5, 6]
Lodash is a popular utility library that provides a _.concat method to merge arrays. This method is useful when you are already using Lodash in your project and prefer a consistent API.
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