#javascript for loop

Every programmer faces a "looping-in" over the countable data set. This data set can be maps, lists, arrays, or any other objects. There are a bunch of tools available to eliminate the exact problem. There are different arrays for different devices in the JavaScript language. So, here are the helpful procedures and methods applied to looping over arrays.

In this article, we will see all the lopping methods of JavaScript.

‘’for’’ loop

‘’for-in’’ loop

‘’.forEach()’’

‘’for-of’’ loop

"for" loop

This loop is quite old from ES1. It is used when the index and values of the array to be logged. For an example, const arr = ['a', 'b', 'c'] and index value is 0. The output will be like below.

"for-in" loop

It's the same old loop as a "for" loop, and it's old from ES1. For-in loop only visits keys, not values. But it is a bad option to skip arrays. It calls all assets keys countlessly, not only array objects. Never use "for-in" Because iteration is not guaranteed, the arrays will not be accessed in numeric order.

.forEach() the array method ES5

For looping arrays, "for" or "for-in" cannot be used, so ES5 method was introduced: Array.prototype.forEach(). It is a very simple method to get an array and elements easily. Please do not use this method because it does not work synchronously. Also, you cannot use it with "async, await." You can not "break.forEach()" loop everywhere. You can use "break" in "for" loops.

"for-of" ES6

"for-of" introduced in ES6. It works very well for looping arrays. You can use "await" in it, and also, it's easy to merge to "for-await-of." For outer scope, you can use "break" and continue."

Conclusion

About for loops with Example in JavaScript

Loops are used in programming to automate repetitive tasks. The most basic types of loops used in JavaScript are the while and do…while statements, which you can review in “How To Construct While and Do…While Loops in JavaScript.”

Because while and do…whilestatements are conditionally based, they execute when a given statement returns as evaluating to true. Similar in that they are also…

Loops are used to perform an action a repeated number of times.

There is also a conditional aspect to loops, though, as every loop uses a condition to determine whether or not to execute the loop’s contents.

  while loop

Format of while loop is :

while (expression) { statement; }

When the program first encounters the while loop, it checks the condition. If the condition evaluates…