Function expression in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a function expression that returns the sum of two numbers.

Javascript

const add = function(a, b) { return a [1] b; }; console.log(add(2, 3));

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

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Forgetting to return the result.

The + operator adds two numbers. Here, it returns the sum of a and b.

2fill in blank

medium

Complete the code to assign an anonymous function to the variable greet that returns 'Hello!'.

Javascript

const greet = [1]() { return 'Hello!'; }; console.log(greet());

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Afunction

Bfun

Cfunc

Ddef

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect keywords like 'fun' or 'def'.

Omitting the function keyword.

The keyword function defines a function expression in JavaScript.

3fill in blank

hard

Fix the error in the function expression syntax.

Javascript

const multiply = function(a, b) [1] return a * b; }; console.log(multiply(4, 5));

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A<

B(

C[

D{

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or brackets instead of curly braces.

Missing the opening brace.

The function body must start with a curly brace { to enclose the statements.

4fill in blank

hard

Complete the code to create a function expression that returns the square of a number.

Javascript

const square = function(num) { return num [1] 2; }; console.log(square(6));

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A{

B**

C*

D(

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication * instead of exponentiation **.

Forgetting the opening brace.

The function body starts with a curly brace {. The exponentiation operator ** raises num to the power of 2.

5fill in blank

hard

Fill both blanks to create a function expression that filters an array to keep only even numbers.

Javascript

const evens = numbers.filter(function([1]) { return [2] % 2 === 0; }); console.log(evens);

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

Anum

B{

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent parameter names.

Forgetting the opening brace.

Incorrect modulo condition.

The parameter name is num. The function body starts with a curly brace {. The condition checks if num is even by using the modulo operator.