This is my preferred method of converting to array because it is semantically very easy to read at a glance. The code looks something like this: const boxArray = Convert to array using om()Īom does what it sounds like it converts array-like objects to actual arrays. This works because the HTMLCollection is iterable. Convert to array using a spread operatorĪ spread operator will allow us to expand the values of our array-like object and push them into a new array. Here are 4 ways to convert the returned HTMLCollection to an array. Ĭonst boxes = document.getElementsB圜lassName('box') Each div has the same class and we query for a HTMLCollection using ‘ getElementsB圜lassName‘. Let’s start with a simple scenario where we have 5 divs. Today I’m going to show you how to make these objects a little bit more useful, by converting them into JavaScript arrays. They include objects with a length property, such as HTMLCollection, NodeList, argument list and even strings. filter( v => v % 2 = 0).Facebook Share Twitter Share LinkedIn ShareĮver had an array-like object that you want to iterate over? These annoying collections, which look like arrays, don’t have access to useful array methods like the ‘ forEach‘ loop. forEach( function callback( value, index) ) // Instead of trying to `continue`, filter out unwanted elements The index parameter is how you get the current array index with forEach(). JavaScript calls your callback with 3 parameters: currentValue, index, andĪrray. That JavaScript will execute on every element in the array. The forEach() method takes a parameter callback, which is a function It is generally considered one of the "functional programming" methods along with filter(), map(), and reduce(). JavaScript's Array#forEach() function is one of several ways to iterate through a JavaScript array.
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