@thi.ng/dlogic/index.js

Assorted digital logic ops / constructs

const not = (x) => !x;
const nand = (a, b) => !(a && b);
const and = (a, b) => a && b;
const or = (a, b) => a || b;
const nor = (a, b) => !(a || b);
const xor = (a, b) => a !== b;
const xnor = (a, b) => a === b;
const imply = (a, b) => !a || b;
const aoi21 = (a, b, c) => !(a || b && c);
const aoi22 = (a, b, c, d) => !(a && b || c && d);
const oai21 = (a, b, c) => !(a && (b || c));
const oai22 = (a, b, c, d) => !((a || b) && (c || d));
const mux = (a, b, s) => a && !s || b && s;
const demux = (i, s) => [
  i && !s,
  i && s
];
const hadd1 = (a, b) => ({
  s: a !== b,
  c: a && b
});
const fadd1 = (a, b, c) => ({
  s: a !== b !== c,
  c: a !== b && c || a && b
});
const rca = (a, b, c) => {
  const s = [];
  for (let n = a.length, i = 0; i < n; i++) {
    const r = fadd1(a[i], b[i], c);
    s.push(r.s);
    c = r.c;
  }
  return { s, c };
};
const delay = (n) => {
  const buf = new Array(n).fill(false);
  let i = 0;
  return n > 0 ? (x) => {
    const y = buf[i];
    buf[i++] = x;
    i %= n;
    return y;
  } : (x) => x;
};
export {
  and,
  aoi21,
  aoi22,
  delay,
  demux,
  fadd1,
  hadd1,
  imply,
  mux,
  nand,
  nor,
  not,
  oai21,
  oai22,
  or,
  rca,
  xnor,
  xor
};