Difference between toString and toNumber

[MikeKovarik]

Hello. I've been using this library through js-xxhash and i was wondering why does XXH('abcd', 0).toString(16) not equals XXH('abcd', 0).toNumber().toString(16)? Is there some standard it complies to? Other than that toNumber is much more performant and serves the same purpose.

var hash1 = XXH('abcd', 0);
var i, t1, t2, t3, t4;

t1 = performance.now();
for (i = 0; i < 100000; i++) {
    hash1.toString(16)
}
t2 = performance.now();

t3 = performance.now();
for (i = 0; i < 100000; i++) {
    Math.abs(hash1.toNumber()).toString(16);
}
t4 = performance.now();

console.log(t2 - t1);
console.log(t4 - t3);

results of this code in Chrome 49

563.4300000000001
53.80499999999995

It's even worse in Edge

13569.654713166914
96.97500422863777

[MikeKovarik]

So I looked into it and came up with a soluition #5

[pierrec]

Very good thank you. Some tests do fail though I will double check why when I have some time.