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Looking for the fastest hash function to get a unique id of a string.
function bitwise(str){
var hash = 0, len = str.length
if (len == 0) return hash;
for (var i = 0; i < len; i++) {
char = str.charCodeAt(i);
hash = ((hash<<5)-hash)+char;
}
return hash;
}
function numbers(str) {
var res = 0,i=(str && str.length)?str.length:0;
while(i--) { res = res * 31 + str.charCodeAt(i); }
return res;
}
function bitwiseconv(str){
var hash = 0, len = str.length
if (len == 0) return hash;
for (var i = 0; i < len; i++) {
hash = ((hash<<5)-hash)+str.charCodeAt(i);
hash = hash & hash; // Convert to 32bit integer
}
return hash;
}
function numbersconv(str) {
var hash = 0,i=(str && str.length)?str.length:0;
while(i--) { hash = (hash * 31 + str.charCodeAt(i)) | 0; }
return hash;
}
function bitwiseReduce(str){
return str.split("").reduce(function(a,b)
{a=((a<<5)-a)+b.charCodeAt(0);return a&a}
,0);
}
HasH = function (str) {
var hash = 0;
for (var i = 0, l = str.length; i < l; i++) {
hash = hash << 7 ^ str.charCodeAt(i);
}
return hash;
}
Ready to run.
Test | Ops/sec | |
---|---|---|
Bitwise based function (No integer conversion) |
| ready |
Number based function (No integer conversion) |
| ready |
Bitwise based function |
| ready |
Number based function |
| ready |
Reduce + bitwise |
| ready |
HasH |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.