Description:
Javascript array every method tests whether all elements in the array pass the test implemented by the provided function.
Syntax:
array.every(callback[, thisObject]); |
Here is the detail of parameters:
- callback : Function to test for each element.
- thisObject : Object to use as this when executing callback.
Return Value:
Returns true if every element in this array satisfies the provided testing function.
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.every)
{
Array.prototype.every = 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))
return false;
}
return true;
};
}
|
Example:
<html>
<head>
<title>JavaScript Array every Method</title>
</head>
<body>
<script type="text/javascript">
if (!Array.prototype.every)
{
Array.prototype.every = 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))
return false;
}
return true;
};
}
function isBigEnough(element, index, array) {
return (element >= 10);
}
var passed = [12, 5, 8, 130, 44].every(isBigEnough);
document.write("First Test Value : " + passed );
passed = [12, 54, 18, 130, 44].every(isBigEnough);
document.write("Second Test Value : " + passed );
</script>
</body>
</html>
|
This will produce following result:
First Test Value : falseSecond Test Value : true |
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