IT. Expert System.

Java Script

forEach()


Description

The forEach() method executes a callback function once for each element present in the array until it finds one where the callback returns a true value. If one is found, forEach immediately returns true. Otherwise, forEach returns false.

This method has the form:

Array.forEach(callback[, thisObject])
Parameter Description
callback (required) Specifies the function to execute for each element

The callback is invoked with three arguments:
1. the value of the element,
2. the index of the element, and
3. the Array object being traversed
thisObject (optional) Specifies the object to use as this when executing callback

If a this parameter is specified, it will be used as the this for each invocation of the callback. If it is not provided, or is null, the global object associated with callback is used instead.

Note: The specified callback is invoked only for indexes of the array which have assigned values; it is not invoked for indexes which have been deleted or which have never been assigned values.

Examples

The following example shows the basic use of this method.

<script>
function showElement(element, index, array) {
document.write("array[" + index + "] = " + element + ", "); }
var array1 = [4, 8, 15, 16, 23, 42].forEach(showElement); </script>

This produces the following result:

Browser Support

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Version Information

This form was added in version: 1.6



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