josephg/gist:1071272

## gistfile1.html
<script>

var arr = [];

for (var i = 0; i < 100000; i++) {
	num = Math.floor(Math.random() * 4147483648) - 2147483648 ;
	if(num <= 0) {
		num--;
	}
	arr.push(num);
}

// Task: iterate through the list, comparing each two adjacent elements and counting how many times
// elem[i+1] has the same sign as elem[i].

var nieve = function() {
	var count = 0;
	for (var i = 0; i < arr.length - 1; i++) {
		if ((arr[i] < 0) == (arr[i + 1] < 0)) {
			count++;
		}
	}
	return count;
};

var mul = function() {
	var count = 0;
	for (var i = 0; i < arr.length - 1; i++) {
		if (arr[i] * arr[i + 1] > 0) {
			count++;
		}
	}
	return count;
};

var xor = function() {
	var count = 0;
	for (var i = 0; i < arr.length - 1; i++) {
		if ((arr[i] ^ arr[i + 1]) >= 0) {
			count++;
		}
	}
	return count;
};

var time = function(f) {
	var start = Date.now();
	for (var i = 0; i < 100; i++) {
		f();
	}
	var end = Date.now();

	return end - start;
};

document.write("nieve: " + time(nieve) + "ms, result = " + nieve());
document.write('<br/>');
document.write("mul: " + time(mul) + "ms, result = " + mul());
document.write('<br/>');
document.write("xor: " + time(xor) + "ms, result = " + xor());
document.write('<br/>');

</script>
	<script>

	var arr = [];

	for (var i = 0; i < 100000; i++) {
	num = Math.floor(Math.random() * 4147483648) - 2147483648 ;
	if(num <= 0) {
	num--;
	}
	arr.push(num);
	}

	// Task: iterate through the list, comparing each two adjacent elements and counting how many times
	// elem[i+1] has the same sign as elem[i].

	var nieve = function() {
	var count = 0;
	for (var i = 0; i < arr.length - 1; i++) {
	if ((arr[i] < 0) == (arr[i + 1] < 0)) {
	count++;
	}
	}
	return count;
	};

	var mul = function() {
	var count = 0;
	for (var i = 0; i < arr.length - 1; i++) {
	if (arr[i] * arr[i + 1] > 0) {
	count++;
	}
	}
	return count;
	};

	var xor = function() {
	var count = 0;
	for (var i = 0; i < arr.length - 1; i++) {
	if ((arr[i] ^ arr[i + 1]) >= 0) {
	count++;
	}
	}
	return count;
	};

	var time = function(f) {
	var start = Date.now();
	for (var i = 0; i < 100; i++) {
	f();
	}
	var end = Date.now();

	return end - start;
	};

	document.write("nieve: " + time(nieve) + "ms, result = " + nieve());
	document.write('<br/>');
	document.write("mul: " + time(mul) + "ms, result = " + mul());
	document.write('<br/>');
	document.write("xor: " + time(xor) + "ms, result = " + xor());
	document.write('<br/>');

	</script>