@thi.ng/colored-noise/utils.js

Customizable O(1) ES6 generators for colored noise

const preseed = (n, scale, rnd) => {
  const state = new Array(n);
  for (let i = 0; i < n; i++) {
    state[i] = rnd.norm(scale);
  }
  return state;
};
const sum = (src) => src.reduce((sum2, x) => sum2 + x, 0);
function* interleave(a, b) {
  const src = [a[Symbol.iterator](), b[Symbol.iterator]()];
  for (let i = 0; true; i ^= 1) {
    const next = src[i].next();
    if (next.done) return;
    yield next.value;
  }
}
export {
  interleave,
  preseed,
  sum
};