jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.
jsperf.com URLs are mirrored at the same path, e.g:
https://jsperf.com/negative-modulo/2
Can be accessed at:
https://jsperf.app/negative-modulo/2
<script>
//memo6 - by @madrobby/thomas fuchs
Function.prototype.cached = function(){
var self = this, cache = {};
return function(arg){
if(arg in cache) {
//console.log('Cache hit for '+arg);
return cache[arg];
} else {
//console.log('Cache miss for '+arg);
return cache[arg] = self(arg);
}
}
}
Function.prototype.cached7 = function(){
"use strict";
var self = this, cache7 = {};
return function(arg){
if(cache7[arg] !== undefined) {
//console.log('Cache hit for '+arg);
return cache7[arg];
} else {
//console.log('Cache miss for '+arg);
return cache7[arg] = self(arg);
}
};
}
//memo1
//underscore.js implem
function memoize1(func, hasher) {
var memo = {};
hasher || (hasher = function(value){
return value; //^this could be done better..surely..
});
return function() {
var key = hasher.apply(this, arguments);
return hasOwnProperty.call(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments));
};
};
//memo2 - another variation with changes by @addyosmani
//based on initial work by thejit
//note: I'm aware of the perils of hanging the implem off
//fn, just want to find out if this version performs much better
function memoize2(fn) {
return function () {
var args = Array.prototype.slice.call(arguments),
hash = "",
i = args.length;
while(i--){
hash += (Object.prototype.toString.call({}) == Object.prototype.toString.call(args[i])) ? JSON.stringify(args[i]) : args[i];
fn.memoize = fn.memoize || {};
}
return (hash in fn.memoize) ? fn.memoize[hash] : fn.memoize[hash] = fn.apply(this, args);
};
}
//memo3 - unscriptables implem.
function memoize3(func, context) {
function memoizeArg (argPos) {
var cache = {};
return function () {
if (argPos == 0) {
if (!(arguments[argPos] in cache)) {
cache[arguments[argPos]] = func.apply(context, arguments);
}
return cache[arguments[argPos]];
}
else {
if (!(arguments[argPos] in cache)) {
cache[arguments[argPos]] = memoizeArg(argPos - 1);
}
return cache[arguments[argPos]].apply(this, arguments);
}
}
}
// JScript doesn't grok the arity property, but uses length instead
var arity = func.arity || func.length;
return memoizeArg(arity - 1);
}
//memo4 - by stevenlevithan
function memoize4(functor, expiration) {
var memo = {};
return function () {
var key = Array.prototype.join.call(arguments, "§");
if (key in memo)
return memo[key];
if (expiration)
setTimeout(function () {delete memo[key];}, expiration);
return memo[key] = functor.apply(this, arguments);
};
}
//memo5 - @gbradley
function memoize5(fn){
var lookup={};
return function(){
var args=[].slice.call(arguments);
var key=JSON.stringify(args);
var result=lookup[key];
if (!result){
result=fn.apply(this,args);
lookup[key]=result;
}
return result;
};
}
function memoize7( fn ) {
return function () {
var args = Array.prototype.slice.call(arguments),
hash = "",
i = args.length,
hasHash = false;
while(i){
hash += (Object.prototype.toString.call({}) == Object.prototype.toString.call(args[--i])) ? JSON.stringify(args[i]) : args[i];
fn.memoize = fn.memoize || {};
}
hasHash = fn.memoize[hash] !== undefined;
return (hasHash) ? fn.memoize[hash] : fn.memoize[hash] = fn.apply(this, args);
};
}
function fib(x) {
if(x < 2) return 1; else return fib(x-1) + fib(x-2);
}
// Redefine to prevent any unknown special inlines...
function fib7(x) {
if(x<2) return 1; else return fib7(x-1) + fib7(x-2);
}
var fibTest1 = memoize1(fib);
var fibTest2 = memoize2(fib);
var fibTest3 = memoize3(fib);
var fibTest4 = memoize4(fib,1000);
var fibTest5 = memoize5(fib);
var fibTest6 = fib.cached();
var fibTest7 = memoize7(fib);
var fibTest7c = fib7.cached7();
</script>
Ready to run.
Test | Ops/sec | |
---|---|---|
Memo 1 - underscore.js |
| ready |
Memo 2 - addy + thejit |
| ready |
Memo 3 - unscriptable |
| ready |
Memo 4 - stevenlevithan |
| ready |
Memo 5 - gbradley |
| ready |
Memo 6 - madrobby |
| ready |
Memo 7 |
| ready |
Memo 7 Cached |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.