Full Stack Capstone Assignment Notes

Introduction

• Presenter: Rakesh, 2nd year CSC
• Topic: JavaScript Variables, Functions, Objects, and Loops

JavaScript Variables

• Keywords for Declaring Variables: var, let, and const
  • var:
    • Can be redeclared and updated.
    • Example: Variable redeclaration and reassignment.
  • let:
    • Can be updated but not redeclared.
    • Example: Redeclaring variable A results in an error, but updating is allowed (e.g., A = 200).
  • const:
    • Cannot change its value after declaration.
    • Example: Changing the value of a const variable results in an error.

Arrays

• Arrays can store multiple elements of similar data types.
• Manipulation of arrays using indexes:
  • Example: Change element at index 0 to 100 and print.
  • Individual elements can be printed using their index.

Functions

• Used to execute a block of code multiple times.
• Example: Function to multiply numbers by 3.
  • Declare a number, call the function with different inputs.
  • Output shows the result after multiplication.

Objects

• Create a file objects.js.
• Access properties using:
  • Dot Notation: e.g., dog.legs
  • Bracket Notation: e.g., dog['tails']
• Updating object properties:
  • Example: Change dog.mode to a new value and print.

Loops

• Create a file loops.js.
• Types of loops: while, do while, for.
  • While Loop: Code to print the first five natural numbers.
  • For Loop: Code to print numbers from 1 to 5.
  • Do While Loop: Similar implementation with a different structure.

Conclusion

• Code examples demonstrate the use of variables, arrays, functions, objects, and loops in JavaScript.