SOURCE

function strKeyGetFormObj() {
  const result = [];
  if (arguments.length === 0) {
    return result;
  }
	const obj = arguments[0];
	for (let i = 1; i < arguments.length; i ++) {
    const keys = arguments[i].replace(/\[/, '.').replace(/\]/, '');
    const keyArr = keys.split('.');
    let tmpRest = obj;
    keyArr.forEach((subKey) => {
      tmpRest = tmpRest[subKey];
    });
  	result.push(tmpRest);
  }
	return result;
}

console.log(strKeyGetFormObj({a: {b: {c: '1'}}, g: [0, 2, {f: 'abc'}]}, 'a.b.c', 'g[2].f'));