Loops can be used with keywords like continue and break, and the conditions for starting stopping, and stepping can be changed. In addition loops provide a greater degree of control and flexibility over that of array prototype methods like that of Array forEach. So the Array.forEach method is not the end all solution in javaScript for looping over an array, in addition to other prototype methods there are also plain old loops like while loops, and for loops that can also be used as a way to loop over all the contents of an array.

Another array prototype method that comes to mind that I find myself using often would be the Array.filter method that will, as the same suggests, return a new array from a source array by filtering out any elements that are not wanted in the source array given a certain condition that is given in the body of a method passed to the filter method. Some such methods are the Array.map method that can be used to create a new array where each element is the result of some kind of action preformed for each element in the source array that it is called off of. However there are other Array prototype methods that work in a similar way, but might be a better choice depending on what you want to do with an Arrays contents. Using for loop const arrayItems = įor (let i = 0 i < arrayItems.In javaScript there is the method that is often used as a quick way to go about looping over the contents of an array. Here is an example of how we can write a program with for loop and with forEach(). For example, // with arrow function and callbackĬonst students =

You can use the arrow function with the forEach() method to write a program. In the above program, the forEach() method takes myFunction() function that displays each element of a students array.Īs we have seen in the above example, the forEach() method is used to iterate over an array, it is quite simple to update the array elements. The forEach() method is used to iterate over an array. index (optional) - the index of the current elementĪrr (optional) - the array of the current elements.

function(currentValue, index, arr) - a function to be run for each element of an array.The syntax of the forEach() method is: array.forEach(function(currentValue, index, arr)) The forEach() method can also be used on Maps and Sets. The forEach() method calls a function and iterates over the elements of an array.

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