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That means you can add string properties to your array, With for and for/in, you need to print out arr: for ( let i = 0 i console.log(v))

For example, suppose you want to print out the values stored in the below array: const arr = The for and for/in looping constructs give you access to the index in the array, not the actual element. I'll also link to the relevant ESLint rules that you can use to enforce looping best practices in your projects. I'll provide an overview of the difference between these looping constructs using several different edge cases. In this article, I'll describe the differences between iterating over an array with the 4 primary looping constructs: Some style guides go so far as to ban certain looping constructs. Tradeoffs are a common cause of confusion. There's numerous ways to loop over arrays and objects in JavaScript, and the You will find it very handy when dealing with Arrays. forEach() for looping through an array elements. The ES6 edition of JavaScript introduced a new method called. The below image illustrates the output printed on the console:Ĭities values from XML 5. var numbers = for (var i = 0 i < numbers.length i++) while (i < cityNames.length) In the below code, I am looping through all the numbers in an array, and printing each of them on the console window. The for loop checks if the counter is inside the limits (initial value to final value), and the loop ends when the counter value goes over the final value. The counter is increased by a specific value every time the loop runs. It uses a counter, whose value is first initialized, and then its final value is specified. It is very handy to execute a block of code a number of times. The For Loop is the most basic way to loop in your JavaScript code. Like the cat, you will also become a Master of JavaScript Looping, after you know all the looping tricks.