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Class-8
Class 8 – Introduction To JavaScript
Class Slides: class 8.1
This lecture focuses on JavaScript data types (primitive and non-primitive), passing arguments by reference, recursive functions, and switch statements. These concepts are essential for understanding how JavaScript handles data and executes conditional logic efficiently.
Key Topics Covered:
1. Primitive and Non-Primitive Data Types:
- Primitive Data Types: Predefined by JavaScript, including Number, String, Boolean, Null, Undefined, BigInt, and Symbol.
- Non-Primitive Data Types: Created by programmers, including Objects, Arrays, and Functions, which store references instead of actual values.
2. Arguments Passed by Reference:
- Primitive data types are passed by value, meaning a copy of the value is used inside a function.
- Non-primitive data types (like objects and arrays) are passed by reference, meaning changes made inside a function affect the original variable.
3. Recursive Functions:
- A function that calls itself repeatedly until it reaches a base condition.
- Commonly used in tasks like calculating factorials and performing iterative operations without using loops.
4. Switch Statements:
- Used for executing different code blocks based on specific conditions.
- Compares values using strict comparison (
===), meaning both value and type must match. - Can include multiple case conditions grouped together for common outputs.
- A
defaultcase is recommended to handle unmatched conditions.
This lecture provides a deeper understanding of JavaScript data types, function behaviors, and switch statements, which are essential for efficient programming and decision-making logic in web applications.