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Web Technologies - JAVASCRIPT

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Lesson Description


Lession - #220 Javascript Array Iteration


Array iteraration method work on each array item.

forEach(>
method

is used is used to iterate items in javascript array.

The JavaScript forEach loop is an Array method that executes a custom callback function on every item in a array. The forEach loop must be utilized on Arrays, Sets, and Maps. A forEach loop will run a JavaScript callback function for every item in a list. Then, at that point, the loop stops.

Let's see an example



<html>
   <head>
      <title>JavaScript Array forEach Method</title>
   </head>
   
   <body>   
      <script type = "text/javascript">
         if (!Array.prototype.forEach>
{ Array.prototype.forEach = function(fun /*, thisp*/>
{ var len = this.length; if (typeof fun != "function">
throw new TypeError(>
; var thisp = arguments[1]; for (var i = 0; i < len; i++>
{ if (i in this>
fun.call(thisp, this[i], i, this>
; } }; } function printBr(element, index, array>
{ document.write("
[" + index + "] is " + element >
; } [12, 5, 8, 130, 44].forEach(printBr>
; </script> </body> </html>

Output


Try it here