What hoisting is in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable using hoisting.

Javascript

console.log([1]); var x = 5;

Drag options to blanks, or click blank then click option'

Ax

By

Cz

Da

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that is not declared.

The variable x is hoisted, so it exists before its declaration but is undefined.

2fill in blank

medium

Complete the code to show hoisting with a function declaration.

Javascript

[1] sayHello() { console.log('Hello!'); } sayHello();

Drag options to blanks, or click blank then click option'

Aconst

Bvar

Clet

Dfunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using var, let, or const instead of function.

Function declarations are hoisted, so sayHello can be called before its definition.

3fill in blank

hard

Fix the error in the code to demonstrate hoisting with var.

Javascript

console.log(a); [1] a = 10;

Drag options to blanks, or click blank then click option'

Alet

Bconst

Cvar

Dfunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using let or const which cause ReferenceError here.

Using var hoists the variable declaration, so a exists but is undefined before assignment.

4fill in blank

hard

Fill both blanks to create a hoisted function expression and call it.

Javascript

var greet = [1]() { console.log('Hi!'); }; greet[2]();

Drag options to blanks, or click blank then click option'

Afunction

B()

C.call

D() =>

Attempts:

3 left

💡 Hint

Common Mistakes

Using arrow function syntax without parentheses in call.

The function expression is assigned to greet and called with parentheses ().

5fill in blank

hard

Fill all three blanks to create a hoisted variable and function, then call the function.

Javascript

console.log([1]); [2] greet() { console.log('Hello!'); } var [1] = 'Hello'; greet[3]();

Drag options to blanks, or click blank then click option'

Amessage

Bfunction

C()

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using var instead of variable name in first blank.

The variable message is hoisted and undefined before assignment. The function greet is declared and called with parentheses.