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.

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.

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.

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. If you are sure that all inputs to merge are arrays, use spread operator.

Jan 28, 2023 · 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. These approaches are immutable because the merge result is stored in a new array.

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.

I'm trying to combine 2 arrays in JavaScript into one. var lines = new Array("a","b","c"); lines = new Array("d","e","f"); This is a quick example, I want to be able to combine them so that when the second line is read the 4th element in the array would return "d"

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. The method accepts a list of values as arguments:

The Array concat() method allows you to merge elements of two or more arrays into a single array. Here’s the syntax of the concat() method: const newArray = array1.concat(array2, array3, ...)