Flattening an array is nothing but merging a group of nested arrays present inside a provided array. The default depth is 1. Array.flat() return a new javascript array with flattening values. Other than that there are many more methods by which we can flatten an array in Javascript. function flatten(arr) { return [].concat(...arr) } Is simply expands arr and passes it as arguments to concat(), which merges all the arrays into one.It’s equivalent to [].concat.apply([], arr).. You can also try this for deep flattening: function deepFlatten(arr) { return flatten( // return shalowly flattened array arr.map(x=> // with each x in array Array.isArray(x) // is x an array? Manny. How to flatten, filter, and sort and array in JavaScript. They are both very useful to what we want to do: flatten an array. Flattening an array. Use flat() to Flatten Arrays to Certain Depth Level in JavaScript This tutorial will introduce how to flatten an array in JavaScript. Array.prototype.flat() The flat()method has an optional argument known as depth (the number of levels to flatten the array) and returns a new array - flattened version of the original array, removing any array hole (empty slot(s) in the array). Flattening of an array can be done in two ways. A practical guide to flattening JavaScript arrays. AMAZING Not anymore! The solution for a popular interview question flatten an array taken one step further to make it an array with only the unique values and have it sorted in numerical order. How to flatten an array in JavaScript A practical guide to flattening JavaScript arrays. The flatMap() method returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level. The flat() method is an inbuilt array method that flattens a given array into a newly created one-dimensional array. # Flatten Array using Array.flat() in JavaScript. In ES6 Array.flat() a method is introduced which so popular to flattening a multidimensional array in javascript. We will learn how to flatten JavaScript arrays with concat(), reduce and ECMAScript 6 Arrays.flat() method that supports multi-depth levels. It was always complicated to flatten an array in #JavaScript. Hopefully you already know that ES6 has made JavaScript really great. Otherwise, the passed argument defines the depth for flattening the array. JavaScript Array flat() Method. In such cases, we need to flatten the array to work with it. Here's a very handy way to flatten multi-dimensional (well, two dimensional, to be precise) arrays. Breaking Down The Steamroller Algorithm Problem From FreeCodeCamp.org. It is identical to a map() followed by a flat() of depth 1, but slightly more efficient than calling those two methods separately. JavaScript Flatten Array Algorithm. With the release of ES2019, this thing i.e flattening of an array can be easily done by using the Javascript Array flat() and flatMap() method. ES2019 introduced a new method that flattens arrays. It concatenates all the elements of the given multidimensional array, and flats upto the specified depth. 1) concat.apply() In the following example there are some nested arrays containing elements 3,4,5 and 6. JavaScript went from pretty cool to oh-my-gosh-this-language-rules in one language spec update. Published Dec 10, 2019. ES2019 introduced two new methods to the Array prototype: flat and flatMap. And there's a "depth" parameter, so you can pass in ANY levels of nesting. We can specify the depth limit to where we need to flatten the array. Syntax: Array.flat(depth) Let’s move on to a code section and see Array.flat() in action. 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