Patterns · medium

33. Simple Memoizer

Cache function results based on arguments.

Implement `memoize(fn)` for single-argument functions.

Required in your answer: new Map()cache.has

Runs in a sandboxed worker

function memoize(fn) {
  const cache = new Map();
  return (arg) => {
    if (cache.has(arg)) return cache.get(arg);
    const res = fn(arg);
    cache.set(arg, res);
    return res;
  };
}

Output appears here.

← 32. Object Flattener 34. Task Pool Limit Logic →