✨ Object.freeze vs Object.seal in JavaScript


❓ Object.seal prevents adding and/or removing properties from the sealed object and makes every existing property non-configurable.

❓ Object.freeze does Exactly what Object.seal do, plus It prevents modifying any existing properties.


❗️ There are Object.isFrozen() and Object.isSealed() methods to check if an object is frozen or sealed.


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📸 Image Credit: [here]
📖 Stack Overflow Answer: [here]
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#JavaScript #Programming


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✨ JavaScript's Garbage Collection

ℹ️ The garbage collector in JavaScript is responsible for reclaiming memory occupied by objects that are no longer needed. This mechanism is done using mark-and-sweep algorithm.

ℹ️ The mark-and-sweep algorithm consists of two main phases:

1️⃣Marking: Garbage collector marks reachable objects from the global object, ensuring none are left unmarked if reachable from a rooted object.

2️⃣ Sweeping: Garbage collector reclaims memory from unmarked objects, freeing it up for future use.


📕 Learn more about the JS's garbage collector's mechanism and best practices on the Medium I have written.


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📚Article (Written by me!): [here]
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#JavaScript #Algorithm


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📱 Abstract Syntax Trees (AST) in JavaScript


ℹ️ AST in JavaScript represents the syntactic structure of code. It's a hierarchical tree-like structure composed of nodes, each representing a syntactic element like variable declarations or function calls. An AST is created through two key stages:


1️⃣ Lexical Analysis (Tokenization): Code is tokenized by a Lexical Analyzer, breaking it down into tokens. Lexical Analysis: Code is tokenized by a Lexical Analyzer, breaking it down into tokens.

2️⃣ Syntax Analysis (Parsing): Tokens are structured into an AST by a Syntax Analyzer or Parser, enabling deeper code analysis.

✔️ AST use cases:

🔣Code Analysis: ESLint, JSHint, TypeScript Compiler (TSC), SonarQube

🔣Code Transformation: Babel, TypeScript Compiler (TSC), SWC

🔣Refactoring: TSLint, TypeScript Compiler (TSC)

🔣Code Generation: TypeScript Compiler (TSC), Babel

🔣Language Tooling: Visual Studio Code, WebStorm, Atom, Sublime Text

🔣Optimization: V8 JavaScript Engine, LLVM (Low-Level Virtual Machine)


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📚 Article: [here]
💻 AST Explorer Tool: [here]
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#JavaScript #computerScience


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