milahu/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>unswitch for loop #jsbench #jsperf</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 N = 500000; // N must be laaaarge
		const a = Array(N);

		const min = 10;
		const max = 1234;

		function make_arrays(N, min, max) {
		    const a = Array(N);
		    if (min == max) {
		        for (let i = 0; i < N; i++) {
		            if (Math.random() < 0.5) {
		                a[i] = NaN;
		            } else {
		                a[i] = min;
		            }
		        }
		    } else {
		        for (let i = 0; i < N; i++) a[i] = min + Math.random() * (max - min);
		    }
		    return [
		        a,
		        a.slice() // copy
		    ];
		}

		const arr_range = make_arrays(N, min, max);
		const arr_minzero = make_arrays(N, 0, max);
		const arr_minequal = make_arrays(N, max, max);

		function else_branch_old(arr) {

			var i;
			var l = arr.length;
			var offset = 0;
			var dim = 1;

		  var range = max - min
		  for (i = offset; i < l; i+=dim) {
		    if (!isNaN(arr[i])) {
		      arr[i] = range === 0 ? .5 : (arr[i] - min) / range
		    }
		  }
		}

		function else_branch_new(arr) {

			var i;
			var l = arr.length;
			var offset = 0;
			var dim = 1;

			if (min == max) {
			  for (i = offset; i < l; i+=dim) {
			    if (!isNaN(arr[i])) {
			      arr[i] = .5
			    }
			  }
			}
			else if (min == 0) {
			  for (i = offset; i < l; i+=dim) {
			    arr[i] = arr[i] / max
			  }
			}
			else {
			  var range = max - min
			  for (i = offset; i < l; i+=dim) {
			    arr[i] = (arr[i] - min) / range
			  }
			}
		}
	};


	suite.add("else_branch_old(arr_range[0]);", function () {
		else_branch_old(arr_range[0]);
	});

	suite.add("else_branch_new(arr_range[1]);", function () {
		else_branch_new(arr_range[1]);
	});

	suite.add("else_branch_old(arr_minzero[0]);", function () {
		else_branch_old(arr_minzero[0]);
	});

	suite.add("else_branch_old(arr_minzero[1]);", function () {
		else_branch_old(arr_minzero[1]);
	});

	suite.add("else_branch_old(arr_minequal[0]);", function () {
		else_branch_old(arr_minequal[0]);
	});

	suite.add("else_branch_old(arr_minequal[1]);", function () {
		else_branch_old(arr_minequal[1]);
	});

	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("unswitch for loop #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>unswitch for loop #jsbench #jsperf</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 N = 500000; // N must be laaaarge
	const a = Array(N);

	const min = 10;
	const max = 1234;

	function make_arrays(N, min, max) {
	const a = Array(N);
	if (min == max) {
	for (let i = 0; i < N; i++) {
	if (Math.random() < 0.5) {
	a[i] = NaN;
	} else {
	a[i] = min;
	}
	}
	} else {
	for (let i = 0; i < N; i++) a[i] = min + Math.random() * (max - min);
	}
	return [
	a,
	a.slice() // copy
	];
	}

	const arr_range = make_arrays(N, min, max);
	const arr_minzero = make_arrays(N, 0, max);
	const arr_minequal = make_arrays(N, max, max);

	function else_branch_old(arr) {

	var i;
	var l = arr.length;
	var offset = 0;
	var dim = 1;

	var range = max - min
	for (i = offset; i < l; i+=dim) {
	if (!isNaN(arr[i])) {
	arr[i] = range === 0 ? .5 : (arr[i] - min) / range
	}
	}
	}

	function else_branch_new(arr) {

	var i;
	var l = arr.length;
	var offset = 0;
	var dim = 1;

	if (min == max) {
	for (i = offset; i < l; i+=dim) {
	if (!isNaN(arr[i])) {
	arr[i] = .5
	}
	}
	}
	else if (min == 0) {
	for (i = offset; i < l; i+=dim) {
	arr[i] = arr[i] / max
	}
	}
	else {
	var range = max - min
	for (i = offset; i < l; i+=dim) {
	arr[i] = (arr[i] - min) / range
	}
	}
	}
	};


	suite.add("else_branch_old(arr_range[0]);", function () {
	else_branch_old(arr_range[0]);
	});

	suite.add("else_branch_new(arr_range[1]);", function () {
	else_branch_new(arr_range[1]);
	});

	suite.add("else_branch_old(arr_minzero[0]);", function () {
	else_branch_old(arr_minzero[0]);
	});

	suite.add("else_branch_old(arr_minzero[1]);", function () {
	else_branch_old(arr_minzero[1]);
	});

	suite.add("else_branch_old(arr_minequal[0]);", function () {
	else_branch_old(arr_minequal[0]);
	});

	suite.add("else_branch_old(arr_minequal[1]);", function () {
	else_branch_old(arr_minequal[1]);
	});

	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("unswitch for loop #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
	});