(I’ve added the “Loop end” statement just so I know when my loop ended.)Ī while statement in JavaScript executes until our boolean condition evaluates to true. The first loop statement I can use is a while statement. Instead of typing them 5 times, I’m going to use loops to lighten my workload. Let’s understand JavaScript Loop with the help of an example, my first job is to print “DataFlair Tutorial for JavaScript” 5 times for the posters that I want to create. We will study the labeled, break and continue statement in our next tutorial on JavaScript Loop Control. JavaScript provides the following loop statements to achieve this: We repeat the sequence of instructions until the test condition is true. In these loops, the test condition determines whether or not the program will exit the loop. Exit Controlled Loops: Any loop where we check the test condition after the statements are executed once is an exit controlled loop.In these loops, the test condition determines whether the program will enter the loop or not. Entry Controlled Loops: Any loop where we check the test condition before entering the loop is an entry controlled loop.There are primarily two types of loops in any programming language, and JavaScript is no exception. Be sure you understand all of them, so you can implement the best loop statement for a given situation. Iteration is the number of times you want to repeat the task (that number can even be zero). They offer to perform iterations with only a few lines of code. JavaScript Loop provides a quick and easy way to do repetitive tasks. Let’s learn about all the loops with their syntax and examples.īut before we start our tutorial I recommend you to have a brief look at JavaScript Conditional Statements What is a JavaScript Loop? There are also some loops that are special in JavaScript, like for…in and for…of loops. These include for, while and do…while loops.
In this article, we will learn about different types of loops available in JavaScript.
How so? Simple, JavaScript uses loops! This tutorial is all about what JavaScript loops are and how we can use them. When we ask JavaScript to execute the same task repeatedly, it’s a lot more efficient than us. Have you ever been punished in school and asked to write the sentence “I will not be late for the class again.” fifty times? It’s so boring, right? Well, JavaScript saves us from this trouble. a simple old-fashioned for loop - async-friendlyįor (let index = 0 index forEach (ES5+ only spec | MDN) (or its relatives some and such) - not async-friendly (but see details).a for-of loop (ES2015+ only spec | MDN) - simple and async-friendly.
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