The use of JavaScript neutralization

one,()

1. Introduction: () is aMethods for freezing of objects. Once the object is frozen,It cannot be added, deleted or modifiedproperty. This needs to ensure the objectIntegrity, prevention of any accidental or intentional changesVery useful in the scene

const person = {
    name: 'Alice',
    age: 30
};
(person);
 = 31; // Invalid = '123 Main St'; // Will not be addeddelete ; // The attribute will not be deleted(person); // Output: { name: 'Alice', age: 30 }/*
 The person object was frozen.  Attempting to modify any attribute, add new attributes, or delete existing attributes will not take effect.  The person object remains unchanged, retaining its initial state
 */

2. Practical application scenarios of scenarios ()

2.1 Immutable data structure: When processing data that should not be changed (such as configuration objects or constants),Freeze these objectsCanMake sure they are consistent throughout the life of the application。

2.2 Status Management: In state management scenarios, especially when using libraries such as Redux, ensuring state immutability is crucial.Freezing state objects prevents unexpected changes, thus leading to a more predictable state transition.

two,()

1: Introduction() is a restriction of object structure changesmethod. Although it's not like()That way, the object is completely immutable, but it canPrevent attribute addition or removal. However, as long asExisting properties are writable, they can still be modified.

const car = {
    make: 'Toyota',
    model: 'Corolla'
};
(car);
 = 'Camry'; // Can modify existing properties = 2020; // Will not be addeddelete ; // The attribute will not be deleted(car); // Output: { make: 'Toyota', model: 'Camry' }/*
 The ar object is enclosed.  We can modify existing properties, such as changing model properties.  However, attempting to add new attributes or delete existing attributes will be blocked
 */

2. Practical application scenarios of ()

2.1 API response data: When processing data received from the API,Enclosing objects ensures consistency of structures. You can update existing data without worryingUnexpected addition or removal can destroy application logic。

2.2 Control variability: In the case where certain variability needs to be allowed but structural changes are to be prevented, () provides a balance. This is especially useful when processing form data.Some fields are editable, butThe overall structure should remain unchanged。

3. Summary

()and()are two powerful methods provided in JavaScript, they areObject variabilityDifferent levels of control are provided.()Suitable for creationCompletely immutable object, make sure its state remains unchanged, forMaintain constant data structuresandEnsure status managementImmutability in it is very useful. and() Allow partial variability,CanModify existing properties but prevent structural changes, This is very useful in handling API responses and scenarios where partial variability is required.

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