Run results for: Finding the Fastest Clamp

Generates a list of random numbers between -1.5 and +1.5 then loops through the list with each function. Functions that uses branches should have more variance in speed since they can potentially exit early. Functions that use arithmetic should have little to no variance but do more computation.

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Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:130.0) Gecko/20100101 Firefox/130.0

Browser: Firefox 130

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

If...else

167K/s

Early Return

162K/s

Ternary Operators

113K/s

Compute Offset in Array

91K/s

Pure Arithmetic

63K/s

Math Min and Max Functions

40K/s

View exact numbers

Test name	Executions per second
✓ If...else	166,995 Ops/sec
Early Return	161,667 Ops/sec
Ternary Operators	113,000 Ops/sec
Compute Offset in Array	90,715 Ops/sec
Pure Arithmetic	62,513 Ops/sec
Math Min and Max Functions	40,330 Ops/sec

Script Preparation code:

var numbers = new Array(1000);
var results = new Array(1000);

for (let i = 0; i < numbers.length; i++);
{
  numbers[i] = (Math.random() - 0.5) * 3;
}

function clamp(min, value, max) {
	if (value >= max)
		return max;
	if (value <= min)
		return min;
	return value;
}

function clamp2(min, value, max) {
	return [min, value, max][1 + (value >= max) - (value <= min)];
}

function clamp3(min, value, max) {
	return Math.max(value, Math.min(value, max));
}

function clamp4(min, value, max) {
    return value <= min ? min : (value >= max ? max : value);
}

function clamp5(min, value, max) {
	if (value >= max)
		return max;
	else if (value <= min)
		return min;
	else
		return value;
}

function clamp6(min, value, max) {
	return  (value >= max) * (max - value) +
			(value <= min) * (min - value) +
			value;
}

Tests:

Early Return
for (let i = 0; i < numbers.length; i++) { results[i] = clamp(0, numbers[i], 1.0); }
Compute Offset in Array
for (let i = 0; i < numbers.length; i++) { results[i] = clamp2(0, numbers[i], 1.0); }
Math Min and Max Functions
for (let i = 0; i < numbers.length; i++) { results[i] = clamp3(0, numbers[i], 1.0); }
Ternary Operators
for (let i = 0; i < numbers.length; i++) { results[i] = clamp4(0, numbers[i], 1.0); }
If...else
for (let i = 0; i < numbers.length; i++) { results[i] = clamp5(0, numbers[i], 1.0); }
Pure Arithmetic
for (let i = 0; i < numbers.length; i++) { results[i] = clamp6(0, numbers[i], 1.0); }