The first one is the 'index' parameter, which represents the index number of each element.īasically, we can see the index number of an element if we include it as a second parameter: numbers. Using the traditional 'for loop' to loop through the array would be like this: for (i = 0 i console.log(number)) Arrow Function Representation Optional Parameters IndexĪlright now let's continue with the optional parameters. In this post, we are going to take a closer look at the JavaScript forEach method.Ĭonsidering that we have the following array below: const numbers = Each method has different features, and it is up to you, depending on what you're doing, to decide which one to use. element: The parameter holds the value of the elements being processed currently. The JavaScript forEach method is one of the several ways to loop through arrays. The Object.entries() method returns an array of arrays, where the inner arrays consist of 2 elements - the key and the value. Syntax: array.forEach (callback (element, index, arr), thisValue) Parameters: This method accepts five parameters as mentioned above and described below: callback: This parameter holds the function to be called for each element of the array.

For each function in javascript