milahu/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>test if type is string</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
	<script src="./suite.js"></script>
</head>
<body>
	<h1>Open the console to view the results</h1>
	<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
</body>
</html>

## suite.js
"use strict";

(function (factory) {
	if (typeof Benchmark !== "undefined") {
		factory(Benchmark);
	} else {
		factory(require("benchmark"));
	}
})(function (Benchmark) {
	var suite = new Benchmark.Suite;

	Benchmark.prototype.setup = function () {
		const str = "hello world";

		const str_object = new String("hello world");

		const null_var = null;
	};


	suite.add("string: type or instance", function () {
		// string: type or instance
		// fastest
		typeof str == 'string' || str instanceof String
	});

	suite.add("object: type or instance", function () {
		// object: type or instance
		// fastest
		typeof str_object == 'string' || str_object instanceof String
	});

	suite.add("null: type or instance", function () {
		// null: type or instance
		// fastest
		typeof null_var == 'string' || null_var instanceof String
	});

	suite.add("string: toString", function () {
		// string: toString
		// this one is really slow, 30x slower than the fastest versions
		// slow cos str is converted to str_object
		Object.prototype.toString.call(str) == '[object String]'
	});

	suite.add("object: toString", function () {
		// object: toString
		Object.prototype.toString.call(str_object) == '[object String]'
	});

	suite.add("null: toString", function () {
		// null: toString
		// this is slow too
		Object.prototype.toString.call(null_var) == '[object String]'
	});

	suite.add("string: charCodeAt", function () {
		// string: charCodeAt
		// this is slow too
		Boolean(str && str.charCodeAt)
	});

	suite.add("object: charCodeAt", function () {
		// object: charCodeAt
		Boolean(str_object && str_object.charCodeAt)
	});

	suite.add("null: charCodeAt", function () {
		// null: charCodeAt
		Boolean(null_var && null_var.charCodeAt)
	});

	suite.add("string: charCodeAt try-catch", function () {
		// string: charCodeAt try-catch
		try { Boolean(str.charCodeAt); }
		catch (_) { false; }
	});

	suite.add("object: charCodeAt try-catch", function () {
		// object: charCodeAt try-catch
		try { Boolean(str_object.charCodeAt); }
		catch (_) { false; }
	});

	suite.add("null: charCodeAt try-catch", function () {
		// null: charCodeAt try-catch
		// this is slow cos of the catch(_) overhead
		try { Boolean(null_var.charCodeAt); }
		catch (_) { false; }
	});

	suite.on("cycle", function (evt) {
		console.log(" - " + evt.target);
	});

	suite.on("complete", function (evt) {
		console.log(new Array(30).join("-"));

		var results = evt.currentTarget.sort(function (a, b) {
			return b.hz - a.hz;
		});

		results.forEach(function (item) {
			console.log((idx + 1) + ". " + item);
		});
	});

	console.log("test if type is string");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>test if type is string</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
	<script src="./suite.js"></script>
	</head>
	<body>
	<h1>Open the console to view the results</h1>
	<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
	</body>
	</html>
	"use strict";

	(function (factory) {
	if (typeof Benchmark !== "undefined") {
	factory(Benchmark);
	} else {
	factory(require("benchmark"));
	}
	})(function (Benchmark) {
	var suite = new Benchmark.Suite;

	Benchmark.prototype.setup = function () {
	const str = "hello world";

	const str_object = new String("hello world");

	const null_var = null;
	};


	suite.add("string: type or instance", function () {
	// string: type or instance
	// fastest
	typeof str == 'string' \|\| str instanceof String
	});

	suite.add("object: type or instance", function () {
	// object: type or instance
	// fastest
	typeof str_object == 'string' \|\| str_object instanceof String
	});

	suite.add("null: type or instance", function () {
	// null: type or instance
	// fastest
	typeof null_var == 'string' \|\| null_var instanceof String
	});

	suite.add("string: toString", function () {
	// string: toString
	// this one is really slow, 30x slower than the fastest versions
	// slow cos str is converted to str_object
	Object.prototype.toString.call(str) == '[object String]'
	});

	suite.add("object: toString", function () {
	// object: toString
	Object.prototype.toString.call(str_object) == '[object String]'
	});

	suite.add("null: toString", function () {
	// null: toString
	// this is slow too
	Object.prototype.toString.call(null_var) == '[object String]'
	});

	suite.add("string: charCodeAt", function () {
	// string: charCodeAt
	// this is slow too
	Boolean(str && str.charCodeAt)
	});

	suite.add("object: charCodeAt", function () {
	// object: charCodeAt
	Boolean(str_object && str_object.charCodeAt)
	});

	suite.add("null: charCodeAt", function () {
	// null: charCodeAt
	Boolean(null_var && null_var.charCodeAt)
	});

	suite.add("string: charCodeAt try-catch", function () {
	// string: charCodeAt try-catch
	try { Boolean(str.charCodeAt); }
	catch (_) { false; }
	});

	suite.add("object: charCodeAt try-catch", function () {
	// object: charCodeAt try-catch
	try { Boolean(str_object.charCodeAt); }
	catch (_) { false; }
	});

	suite.add("null: charCodeAt try-catch", function () {
	// null: charCodeAt try-catch
	// this is slow cos of the catch(_) overhead
	try { Boolean(null_var.charCodeAt); }
	catch (_) { false; }
	});

	suite.on("cycle", function (evt) {
	console.log(" - " + evt.target);
	});

	suite.on("complete", function (evt) {
	console.log(new Array(30).join("-"));

	var results = evt.currentTarget.sort(function (a, b) {
	return b.hz - a.hz;
	});

	results.forEach(function (item) {
	console.log((idx + 1) + ". " + item);
	});
	});

	console.log("test if type is string");
	console.log(new Array(30).join("-"));
	suite.run();
	});