Description:
Javascript array some() method tests whether some element in the array passes the test implemented by the provided function.
Syntax:
array.some(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:
If some element pass the test then it returns true otherwise false.
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.some)
{
Array.prototype.some = 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 true;
}
return false;
};
}
|
Example:
<html>
<head>
<title>JavaScript Array some Method</title>
</head>
<body>
<script type="text/javascript">
if (!Array.prototype.some)
{
Array.prototype.some = 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 true;
}
return false;
};
}
function isBigEnough(element, index, array) {
return (element >= 10);
}
var retval = [2, 5, 8, 1, 4].some(isBigEnough);
document.write("Returned value is : " + retval );
var retval = [12, 5, 8, 1, 4].some(isBigEnough);
document.write("<br />Returned value is : " + retval );
</script>
</body>
</html>
|
This will produce following result:
Returned value is : false Returned value is : true |
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