JavaScript - Array some() Method
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Description
Javascript array some() method tests whether some element in the array passes the test implemented by the provided function.
Syntax
Its syntax is as follows −
array.some(callback[, thisObject]);
Parameter Details
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 the 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
Try the following example.
Live Demo<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>
Output
Returned value is : false Returned value is : true
javascript_arrays_object.htm
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