setObjectPropsTrampoline.js

function trampoline(fn) {
  return function trampolined(...args) {
    let result = fn(...args);
    while (typeof result === 'function') {
      result = result();
    }
    return result;
  };
}

const setObjectPropsTrampoline = (accumulator, obj) => {
  const go = (acc, keys) => {
    if (keys.length === 0) {
      return acc;
    }
    const [firstKey, ...restKeys] = keys;
    const newAcc = { ...acc, [firstKey]: obj[firstKey] };
    return () => go(newAcc, restKeys);
  };

  return trampoline(go)(accumulator, Object.keys(obj));
};

const result = setObjectPropsTrampoline({ path: 'home' }, { name: 'Nolan', last: 'Rosie' });
console.log('result:', result);