Function dig

src/optimize.ts:34–51

(obj?: any, ...keys: string[])

 * avoid if (a && a.b && a.b.c)
 */
export function dig(obj?: any, ...keys: string[]) {
  if (!obj) {
    return;
  }
  if (keys.length === 0) {
    return obj;
  }

  let value = obj[keys[0]];
  for (let i = 1; i < keys.length; i++) {
    if (!value) {
      break;
    }
    value = value[keys[i]];
  }

  return value;
}

/**
 * optimize arguments to array