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Ace Your JavaScript Interview: All About Object.freeze and Object.seal + Object.preventExtensions!
Ace Your JavaScript Interview: Mastering Object.freeze, Object.seal, and Object.preventExtensions
JavaScript offers powerful features for controlling the mutability of objects. Three key methods — Object.freeze, Object.seal, and Object.preventExtensions—allow developers to enforce varying degrees of immutability on objects. Understanding these methods is crucial for building robust applications and excelling in technical interviews. This article will dive deep into each technique, explore their differences, and learn practical use cases.
Understanding Mutability in JavaScript
Before diving into the specifics, let’s clarify what mutability means. In JavaScript, objects are mutable by default. This means that their properties can be added, modified, or deleted unless explicitly restricted.
To enhance security, enforce immutability, or prevent unintentional modifications, developers can use Object.freeze, Object.seal, and Object.preventExtensions. Each method provides a different level of restriction.
