In today’s article, we’ll learn how to use the comma to extend each of the for loop statement’s three evaluation parts – initialize, condition, and increment – to take your for loops to a whole new level.

is the array to look through, is the value you are looking for, and fromIndex is the index to start from (defaults to 0).

If the value is not contained in the array, it returns -1. The latter is made possible by the oft overlooked comma operator. It loops through an array, finding and returning the first index of a value. The JavaScript interpreter is lenient both towards missing arguments the inclusion of extra ones. Beneath their deceptively simple syntax belies a highly malleable and extendable construct. In fact, you can do a lot more with for loops that you probably ever thought possible. It’s concise, easy to use, and can handle just about any looping tasks that you might be faced with. Of all the loop types in JavaScript, the for loop is arguably the most versatile. Getting Fancy with the JavaScript For Loop

Js for loop