type.js AKA clazz constructor ctor.js (more granular than built-in typeof which returns "object" for most things)

type.js AKA clazz constructor ctor.js

// type.js AKA clazz constructor ctor.js (more granular than built-in typeof which returns "object" for most things)

// T=a=>({}).toString.call(a).slice(8,-1);	// use case: if you have no need for JScript support
// T=function(a){return(null==a?a+"":{}.toString.call(a).slice(8,-1))}; 	// use case: non-JScript returns the same as JScript -- "null"/"undefined" instead of "Null"/"Undefined"
// T=function(a){return(/*@cc_on @if(@_jscript) null==a?a+"": @end@*/{}.toString.call(a).slice(8,-1))};	// use case: only JScript returns "null"/"undefined", while non-JScript returns "Null"/"Undefined"

var type = function(v) {
	return (
		/*@cc_on @if(@_jscript) v == null ? String(v) : @end@*/
		{}.toString.call(v).slice(8,-1)	// smaller than Object.prototype.toString.call(v).slice(8,-1)
	);
};



/*@cc_on @if(@_jscript) console={log:function(){var b=arguments;b.length&&WScript.Echo([].join.call(b," "))}}; @end@*/

console.log([
	type({}),
	type([]),
	type(3.690),
	type(Math.PI),
	type(Infinity),
	type(NaN),
	type(),
	type(undefined),
	type([,][0]),
	type(null)
]);
//    (10) ['Object', 'Array', 'Number', 'Number', 'Number', 'Number', 'Undefined', 'Undefined', 'Undefined', 'Null']
// JSCRIPT=['Object', 'Array', 'Number', 'Number', 'Number', 'Number', 'undefined', 'undefined', 'undefined', 'null']

console.log([
	type(false),
	type(""),
	type(new Date),
	type(Date),
	type(Error),
	type(new Error("42")),
	type(new TypeError("_")),
	type(/xyz/img)
]);
// (8) ['Boolean', 'String', 'Date', 'Function', 'Function', 'Error', 'Error', 'RegExp']

if(Date.now)console.log([
	type(location),
	type(new WeakMap()),
	type(Symbol(42)),
	type(BigInt(9001)),
	type(new Float64Array( [ 3.14, 0.15, 0.9] ) ),
	type(eval("var gen = function*(){}; gen")),
	type(eval("var af = async function(){}; af")),
	type(eval("class cls{}; cls")),
	type(eval("class CustomArray extends Array { }; new CustomArray()")),	// via https://stackoverflow.com/questions/62074163/understanding-array-isarray-polyfill/62075462#62075462
	type(eval("class Custom { }; new Custom()")),
	type(eval("var arw = () => {}; arw")),
	type(document.querySelectorAll("*"))
]);
// (12) ['Location', 'WeakMap', 'Symbol', 'BigInt', 'Float64Array', 'GeneratorFunction', 'AsyncFunction', 'Function', 'Array', 'Object', 'Function', 'NodeList']