Jun 10, 2010 · There are various way to loop through array in JavaScript. Generic loop: var i; for (i = 0; i < substr.length; ++i) { // Do something with `substr[i]` } ES5's forEach: substr.forEach(function(item) { // Do something with `item` }); jQuery.each:

Array iteration methods operate on every array item: Array every () Array some () Array from () Array keys () Array entries () Array with () Array Spread (...) The forEach () method calls a function (a callback function) once for each array element. Note that the function takes 3 arguments: The example above uses only the value parameter.

Loops can execute a block of code a number of times. Loops are handy, if you want to run the same code over and over again, each time with a different value. Often this is the case when working with arrays: JavaScript supports different kinds of loops: The for statement creates a loop with 3 optional expressions:

Oct 31, 2023 · Now, let's explore the different ways to loop through arrays in JavaScript. 1. Using the for Loop. The traditional for loop is one of the simplest and most versatile ways to loop through an array. It allows you to have complete control over the loop's behavior. console.log(fruits[i]); }

6 days ago · The for…of loop is a modern way to loop through arrays in JavaScript. It iterates directly over the values of the array, which makes the syntax more concise and easier to understand compared to the traditional for loop.

Feb 17, 2012 · forEach is the "loop through them all" function, but ES5 defined several other useful "work your way through the array and do things" functions, including: every (spec | MDN) - stops looping the first time the callback returns a falsy value; some (spec | MDN) - stops looping the first time the callback returns a truthy value

The most common ways to loop through an array in JavaScript are the for, for/in and while loops. See how to use them. Examples.

Jan 10, 2025 · JavaScript for Loop can be used to iterate over an array. The for loop runs for the length of the array and in each iteration it executes the code defined inside. We can access the array elements using the index number. 1. Using for…of Loop. The for…of loop iterates over the values of an iterable object such as an array.

Jun 23, 2022 · How to Loop Through an Array with a forEach Loop in JavaScript. The array method forEach() loop's through any array, executing a provided function once for each array element in ascending index order. This function is known as a callback function.

Some use cases of looping through an array in the functional programming way in JavaScript: 1. Just loop through an array. console.log(element.x); // 100, 200, 300. console.log(index); // 0, 1, 2. console.log(array); // same myArray object 3 times.