1. Understanding the var Keyword
2. The let Keyword: A Game-Changer
The let keyword was introduced to address some of the issues associated with var. It brings block-level scoping and is now widely used for variable declarations.
3. const: The Immutable Variable
Constants, declared with the const keyword, provide a way to create variables that cannot be reassigned. We'll explore when and how to use them effectively.
4. Primitive Data Types
Boolean variables have only two possible values: true and false. They play a crucial role in conditional statements.
5. Reference Data Types
Objects are collections of key-value pairs, making them incredibly versatile. We'll explore their usage and manipulation.
Arrays are used to store collections of data. We'll discuss how to create, manipulate, and iterate through arrays.
7. Scope and Hoisting
8. Best Practices in Variable Naming
Good coding practices include meaningful variable names. Learn the best practices for naming your variables.
9. The Temporal Dead Zone (TDZ)
The TDZ is a concept related to variable declarations. Understanding it can help you avoid unexpected bugs in your code.
10. Global vs. Local Scope
Scope determines where a variable is accessible. We'll discuss global and local scopes in detail.
11. Closures and Variables
13. Common Mistakes to Avoid
FAQs (Frequently Asked Questions)
A1: ‘let’ allows variable reassignment, while const creates variables that cannot be changed after assignment.
Q2. Why is the var keyword considered outdated?
A2: ‘var’ lacks block-level scope, making it error-prone and less predictable compared to ‘let’ and ‘const’.
Q4. What is the purpose of the Temporal Dead Zone (TDZ)?
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