JavaScript Variables & Hoisting Quiz

Quiz
•
Information Technology (IT)
•
Professional Development
•
Medium
Mohammad Allam
Used 4+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the difference between var, let, and const in terms of scope.
let is function-scoped, var and const are block-scoped.
const is function-scoped, var and let are block-scoped.
var is block-scoped, let and const are function-scoped.
var is function-scoped, let and const are block-scoped. const variables cannot be reassigned.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Consider this code snippet:
console.log(a); // What will be the output?
var a = 10; console.log(a); // What will be the output?
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is hoisting in JavaScript?
Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope before code execution.
Hoisting is a JavaScript concept that refers to the process of optimizing code execution for faster performance.
Hoisting is a JavaScript feature that allows variables to be declared without using the 'var' keyword.
Hoisting is a JavaScript mechanism where variables and function declarations are moved to the bottom of their scope before code execution.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Consider this code snippet:
{
let d = 25;
}
console.log(d); // What will be the output?
ReferenceError
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When should you use const over let in JavaScript?
When the variable is declared inside a function
When the variable will be reassigned multiple times
When the variable is used in a loop
When the variable will not be reassigned
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between global and local scope in JavaScript?
Global scope variables are only accessible within the function they are declared in.
Global scope variables are accessible from anywhere in the code, while local scope variables are only accessible within the function they are declared in.
Local scope variables are accessible from anywhere in the code.
Global scope variables are limited to a specific block of code.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What type of error happens if you try to access a variable before it is declared in JavaScript?
SyntaxError
TypeError
RuntimeError
ReferenceError
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