Array.from({ length: 10 }, seedrandom("Hello."))
Array.from({ length: 10 }, original("Hello."))
seedrandom = (function() {
const width = 256,
chunks = 6,
digits = 52;
const startdenom = Math.pow(width, chunks),
significance = Math.pow(2, digits),
overflow = significance * 2,
mask = width - 1;
return function(seed) {
const arc4 = new ARC4(mixkey(seed));
return function() {
let n = arc4.g(chunks),
d = startdenom,
x = 0;
while (n < significance) {
n = (n + x) * width;
d *= width;
x = arc4.g(1);
}
while (n >= overflow) {
n /= 2;
d /= 2;
x >>>= 1;
}
return (n + x) / d;
};
function ARC4(key) {
const me = this,
s = (me.S = []);
let t,
keylen = key.length,
i = 0,
j = (me.i = me.j = 0);
if (!keylen) key = [keylen++];
while (i < width) s[i] = i++;
for (i = 0; i < width; i++) {
s[i] = s[(j = mask & (j + key[i % keylen] + (t = s[i])))];
s[j] = t;
}
(me.g = function(count) {
const s = me.S;
let t,
r = 0,
i = me.i,
j = me.j;
while (count--) {
t = s[(i = mask & (i + 1))];
r =
r * width +
s[mask & ((s[i] = s[(j = mask & (j + t))]) + (s[j] = t))];
}
me.i = i;
me.j = j;
return r;
})(width);
}
};
function mixkey(seed) {
seed = String(seed);
const key = [];
let smear,
j = 0;
while (j < seed.length) {
key[mask & j] =
mask & ((smear ^= key[mask & j] * 19) + seed.charCodeAt(j++));
}
return key;
}
})()
original = require("seedrandom")
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.