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# Javascript Array forEach() Method

## Description:

Javascript array forEach() method calls a function for each element in the array.

## Syntax:

    array.forEach(callback[, thisObject]);

Here is the detail of parameters:

- callback : Function to test each element of the array.

- thisObject : Object to use as this when executing callback.

## Return Value:

Returns created array.

## Compatibility:

This method is a JavaScript extension to the ECMA-262 standard; as such it may not be present in other implementations of the standard. To make it work you need to add following code at the top of your script:

    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);
        }
      };
    }

## 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("<br />[" + index + "] is " + element );
    }

    [12, 5, 8, 130, 44].forEach(printBr);

    </script>
    </body>
    </html>

This will produce following result:

    [0] is 12
    [1] is 5
    [2] is 8
    [3] is 130
    [4] is 44

To understand it in better way you can Try it yourself.

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