JavaScript Hoisting and Scope Quiz JavaScript Hoisting and Scope Quiz Test your knowledge of JavaScript Hoisting and Scope with this interactive quiz! Learn the key differences between var, let, and const, understand function hoisting, and master variable scope in JavaScript. 1 / 15 What happens if you declare a var variable inside a block (e.g., within an if statement)? It is scoped to the block It is function-scoped or globally scoped It throws an error 2 / 15 Which of the following is NOT a valid use of let? Declaring a block-scoped variable Reassigning a value to an existing let variable Redeclaring a let variable in the same scope 3 / 15 How does function hoisting work in JavaScript? Only function expressions are hoisted Both function declarations and function expressions are hoisted Function declarations are hoisted, but function expressions are not 4 / 15 Which of the following is true for variables declared with var? They are not hoisted They are block-scoped They can be updated and re-declared 5 / 15 What type of error occurs when trying to reassign a const variable? SyntaxError ReferenceError TypeError 6 / 15 In which scenario would you get a ReferenceError due to hoisting? When accessing a var variable before declaration When accessing a let or const variable before declaration When declaring a variable without initializing it 7 / 15 Which keyword should be used for declaring a constant variable that cannot be reassigned? var let const 8 / 15 What is the behavior of const when hoisted? It is initialized with undefined b) c) It exists in a Temporal Dead Zone (TDZ) until initialization It can be accessed before declaration 9 / 15 Which of the following variables is block-scoped? var let Both var and let 10 / 15 What value is assigned to a var variable before initialization? null undefined Throws an error 11 / 15 Where is a function-scoped variable accessible? Only within the function where it’s declared Throughout the entire code Within the block where it’s declared 12 / 15 Which scope allows variables to be accessible everywhere in the code? Block scope Function scope Global scope 13 / 15 What happens when you try to access a let variable before declaration? Returns undefined Throws a ReferenceError Automatically assigns the value null 14 / 15 Which of the following is true about var in JavaScript? var is block-scoped var can be redeclared in the same scope var is not hoisted 15 / 15 What is hoisting in JavaScript? Moving function and variable declarations to the top of their scope Moving only variable values to the top of their scope Hoisting only applies to let and const Your score isThe average score is 53% 0% Restart quiz Read Before Attempting Quiz: Do You Know Hoisting in JavaScript? Discover the Secrets of Variable Scope Other Quizzes Share on FacebookPost on XFollow usSave You Might Also Like Primitive Data Types, JavaScript Quiz September 2, 2024 Javascript Basics Quiz August 23, 2024 Non-Primitiva Data Types, JavaScript Quiz September 2, 2024 Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
