A practical guide to flattening JavaScript arraysES2019 introduced two new methods to the Array prototype: flat and flatMap. They are both very useful to what we want to do: flatten an array.Let’s see how they work.But first, a word of warning: only Firefox 62+, Chrome 69+, Edge ...
You can do the same with a for..in loop to iterate on an object:const fun = (prop) => { return new Promise(resolve => { setTimeout(() => resolve(`done ${prop}`), 1000); }) } const go = async () => { const obj = { a: 1, b: 2, c: 3 }; for (const prop in...
In vanilla JavaScript, you can use the Array.concat() method to flatten a multi-dimensional array. This method works in all modern browsers, and IE6 and above.Here is an example:const animals = [ ['🐍'], ['🐢'], ['🐝'], ['🐉'], ['🐋'] ]; const flattened = []....
The most straightforward way to sum an array in JavaScript is by using a classic for loop. This method is particularly useful for beginners to understand how arrays work and how to iterate through them. function sumArray(arr) { let sum = 0; for (let i = 0; i < arr.length; i++) ...
If your string has unknown number of whitespaces before/after in any order/number, then you can use Array.prototype.map() to iterate over each item in the resulting array (from String.prototype.split()) and use String.prototype.trim() to trim any whitespaces: ...
In the JavaScript code, we have an array namedimgArraycreated to storeImageobjects.Imageobjects are created, and their sources are assigned to elements in theimgArray. We also have thenextImage()function designed to display the next image in the slideshow. It retrieves the current image element...
JavaScript – Loop over Elements of an Array To loop over elements of an array in JavaScript, we can use Array.forEach() method, or any other looping statement like For Loop, or While Loop. In this tutorial, we will go through each of these looping techniques to iterate over elements ...
In vanilla JavaScript, there are multiple ways to clone the contents of an array. You can either use the Array.slice() method, the Array.from() method, or the spread operator (...) to duplicate an array. You don't need to use a loop to iterate over all elements of an array and ...
In this example, thefor-ofloop iterates over each element of the array, assigning the current element to the variableelementon each iteration. ForEach() method JavaScript arrays also have a built-in method calledforEach()that can be used to loop through an array. TheforEach()method takes ...
To trim all strings in an array use the `map()` method to iterate over the array and call the `trim()` method on each array element.