Object.seal()
ES5+Seals an object, preventing new properties from being added and marking all existing properties as non-configurable.
Syntax
Object.seal(obj)Parameters
obj Object The object to seal
Return Value
Object
The sealed object
Examples
JavaScript
const obj = { name: 'John' };
Object.seal(obj);
obj.name = 'Jane'; // 가능
obj.age = 30; // 무시됨
console.log(obj);Output:
// { name: 'Jane' }