Oct 18, 2009 · Here's the simplest way to merge primitive and object arrays: const c = [...a]; // copy to avoid side effects. // add all items from B to copy C if they're not already present. b.forEach((bItem) => (c.some((cItem) => predicate(bItem, cItem)) ? null : c.push(bItem))) return c;

The concat() method concatenates (joins) two or more arrays. 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.

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.

Nov 7, 2024 · How to Merge/Combine Arrays using JavaScript? Given two or more arrays, the task is to merge (or combine) arrays to make a single array in JavaScript. The simplest method to merge two or more arrays is by using array.concat () method. The contact () method concatenates (joins) two or more arrays.

Feb 22, 2011 · For the particular case of creating a new array that concatenates two existing arrays, it appears concat() is generally faster. For the case of concatenating an array onto an existing array in place, push() is the way to go.

There are more than a couple of ways to merge two or more arrays into one in JavaScript. Using the spread operator or the concat() method is the most optimal solution.

JavaScript offers multiple ways to merge arrays. You can use either the spread operator [...array1, ...array2], or a functional way [].concat(array1, array2) to merge 2 or more arrays.

Nov 11, 2024 · Given two arrays, the task is to merge both arrays and remove duplicate items from merged array in JavaScript. The basic method to merge two arrays without duplicate items is using spread operator and the set constructor.

Nov 28, 2022 · You use the concat method of arrays to combine the contents of an array with new values to form a new array. These new values can be numbers, strings, booleans, objects, or even, arrays.

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