let, var, and const

• Key Concepts to Cover:
  • Differences between let, var, and const.
  • Block-scoping with let and const.
  • Reassignability with let and immutability with const.
  • Hoisting behavior of var vs. let and const.
• Practice Questions:
  • What is the difference between let, var, and const in JavaScript?
  • Write code examples where the difference in scoping of let and var affects the output.
  • Explain how const works with objects and arrays.
• Task:
  • Write a program where the variables are declared using all three (let, var, const) and explain the output when used inside and outside a function block.

Data Types

• Key Concepts to Cover:
  • Primitive vs. non-primitive data types.
  • Numbers, Strings, Booleans, null, undefined, Symbols.
  • Reference types: Objects, Arrays, and Functions.
  • Type coercion and type conversion.
• Practice Questions:
  • What are primitive and non-primitive data types in JavaScript?
  • Explain how type coercion works in JavaScript with examples.
  • Write a program to check whether a variable is primitive or non-primitive.
• Task:
  • Write a program demonstrating type coercion in a comparison (e.g., using == and ===).

Scope

• Key Concepts to Cover:
  • Function scope, Block scope, and Global scope.
  • Lexical scoping and the this keyword.
• Practice Questions:
  • What is the difference between function scope and block scope?
  • How does lexical scoping work in JavaScript? Provide an example.
  • How is this determined in different scopes?
• Task:
  • Write a program demonstrating the difference between function scope and block scope using functions and let, var.

Hoisting

• Key Concepts to Cover:
  • How hoisting works with var, let, const, and functions.
  • Temporal Dead Zone (TDZ) related to let and const.
• Practice Questions:
  • Explain how variable and function hoisting works in JavaScript.
  • What is the Temporal Dead Zone (TDZ)? How does it relate to hoisting?
  • Write a program that shows how hoisting affects variables declared with var vs let.
• Task:
  • Create a function and demonstrate hoisting of variables and functions within it. Explain the output.

Temporal Dead Zone (TDZ)

• Key Concepts to Cover:
  • TDZ for let and const.
  • The relationship between hoisting and TDZ.
• Practice Questions:
  • What is the Temporal Dead Zone, and how does it affect the execution of let and const?
  • Explain why accessing a let or const variable before declaration throws an error.