The concat() method returns a new array, containing the joined arrays. The concat() method does not change the existing arrays. array1,... Required. The array (s) to be concatenated. The content from the joined arrays. concat() is an ECMAScript1 (JavaScript 1997) feature. It …

Apr 3, 2025 · The concat () method of Array instances is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.

Jul 15, 2024 · The concat () method concatenates (joins) two or more arrays. It returns a new array, containing the joined arrays. This method is useful for combining arrays without modifying the originals. Syntax: let newArray1 = oldArray.concat() let newArray2 = oldArray.concat(value0) let newArray3 = oldArray.concat(value0,value1) ....... .......

Feb 22, 2011 · For the case of concatenating an array onto an existing array in place, push() is the way to go. I updated my answer. I can attest that extending a single array with several new arrays using the push.apply method confers a huge performance advantage (~100x) over the simple concat call.

In this tutorial, you will learn how to use the JavaScript Array concat () method to merge two or more arrays into a single array.

Apr 4, 2025 · In this article we show how to merge arrays using the concat method in JavaScript. Array concatenation is the operation of joining two or more arrays end-to-end. The concat method is used to merge two or more arrays without modifying the original arrays. Instead, it returns a new array containing the joined elements.

Feb 1, 2025 · A comprehensive guide to the JavaScript Array concat () method, explaining how to combine arrays and create new arrays without modifying the original ones.

JavaScript provides multiple ways to concatenate arrays, including the concat() method, the spread operator (...), and even push() in some advanced use cases. The concat() method returns a new array containing the merged values of the original arrays: const numbers2 = [4, 5, 6]; const result = numbers1.concat(numbers2);

The Array.concat() method in JavaScript is used to merge two or more arrays into a new array. This method does not modify the existing arrays but instead returns a new array.

Aug 26, 2024 · Array.concat () – Flexible & Flattening. The concat() instance method has existed since JavaScript‘s origins: Pros: Custom order, flattens arrays/values, immutable. Cons: Verbose, slower than spread. Use For: Programmatic order, flattening, matrix manipulations. 3. Array.push () – The Mutator.