Fibonacci ES6 Generator

fibonacci-generator.js

export function *fibonacci(n) {
  const infinite = !n && n !== 0;
  let current = 0n;
  let next = 1n;
  while (infinite || n--) {
    yield current;
    [current, next] = [next, current + next];
  }
}

main.js

#!/usr/bin/env -S deno run

"use strict";

import { fibonacci } from "https://gist.github.com/eNV25/531f9b74a6aaec2bb332118bf9d9a26d/raw/fibonacci-generator.js";

console.log([...fibonacci(Deno.args[0] || 10)].join(", "))

recursive-fibonacci-generator.js

export function *fibonacci(n, current = 0n, next = 1n) {
  if (n === 0) {
    return current;
  }
  yield current;
  yield *fibonacci(--n, next, current + next);
}

usage.js

console.log([...fibonacci(10)]);
// [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]