Checks if an object is deeply frozen.
- Use recursion.
- Use
Object.isFrozen()
on the given object. - Use
Object.keys()
,Array.prototype.every()
to check that all keys are either deeply frozen objects or non-object values.
代码实现
const isDeepFrozen = obj =>
Object.isFrozen(obj) &&
Object.keys(obj).every(
prop => typeof obj[prop] !== 'object' || isDeepFrozen(obj[prop])
);
const x = Object.freeze({ a: 1 });
const y = Object.freeze({ b: { c: 2 } });
isDeepFrozen(x); // true
isDeepFrozen(y); // false