Code to determine the browser's javascript version_javascript skills

var JS_ver = [];
(Number.prototype.toFixed)?JS_ver.push("1.5"):false;
([].indexOf && [].forEach)?JS_ver.push("1.6 "):false;
((function(){try {[a,b] = [0,1];return true;}catch(ex) {return false;}})())?JS_ver.push ("1.7"):false;
([].reduce && [].reduceRight && JSON)?JS_ver.push("1.8"):false;
("".trimLeft)?JS_ver.push( "1.8.1"):false;
JS_ver.supports = function()
{
if (arguments[0])
return (!!~this.join().indexOf(arguments [0] ",") ",");
else
return (this[this.length-1]);
}
alert("Latest Javascript version supported: " JS_ver.supports ());
alert("Support for version 1.7 : " JS_ver.supports("1.7"));