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tifuhash 32 bit in a mini package
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// tifuhash 32-bit (c) dosyago & k stringfellow 2017 MIT LICENSE https://www.npmjs.com/package/tifuhash | |
let f = ( s = 0, m = '', ...n ) => { | |
s = parseFloat(s); m = Array.from(m).concat(n).map(x => isNaN(parseFloat(x)) ? x.charCodeAt(0) : parseFloat(x)); | |
let a=new Float64Array(4); | |
a[0] = 1; | |
a[2] = s ? Math.pow(s+1/s, 1/2) : 3; | |
a[3] = s ? Math.pow(s+1/s, 1/5) : 7; | |
m.forEach((x,i) => { | |
a[1] = (x+i+1)/a[3]; | |
a[2] += a[0]/a[1]; a[2] = 1/a[2]; | |
a[3] += x; a[3] = a[0]/a[3]; | |
a[0] = a[1]+1; | |
}); | |
a[2] *= Math.PI+a[3]; | |
a[3] *= Math.E+a[2]; | |
const h = new Uint32Array(a.buffer); | |
return (h[4]^h[5]^h[6]^h[7])>>>0; | |
}; | |
// useful for strings | |
console.log("strings..."); | |
console.log(f(0,"analyze this")); // 2587049505 | |
console.log(f(0,"analyze thit")); // 2523560067 | |
console.log(f(0,"analyze that")); // 1994125995 | |
// or numbers | |
console.log("numbers..."); | |
console.log(f(0,1,2,3,4,5)); // 3120845206 | |
console.log(f(5,4,3,2,1,0)); // 3487245198 | |
console.log(f(5,4,3,2,0,1)); // 451932417 | |
// or floats | |
console.log("floats..."); | |
console.log(f(0,1,2,3,4+1e-15,5.000000001)); // 3127534970 | |
console.log(f(0,Math.PI,Math.E,1<<30,1/(1<<31))); // 1471402665 | |
// or tiny floats | |
console.log("tiiiny floats..."); | |
console.log(f(0,1,2,3+1e-15,4,5)); // 3120845212 | |
console.log(f(0,1,2,3+2e-15,4,5)); // 3120845209 | |
console.log(f(0,1,2,3+3e-15,4,5)); // 3120845410 | |
console.log(f(0,1,2,3+4e-15,4,5)); // 3120845412 | |
console.log(f(0,1,2,3,4+1e-15,5)); // 3120845202 | |
// or just nothing but seed | |
console.log("seeds..."); | |
console.log(f(0)); // 2702599175 | |
console.log(f(1)); // 3794067143 | |
console.log(f(Math.PI)); // 2450270461 | |
// or maybe an rng? | |
console.log("rng?"); | |
console.log(f(0), f(f(0)), f(f(f(0)))); // 2702599175 3590320966 2801714996 |
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