Return values in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the sum of two numbers.

Javascript

function add(a, b) {
  return a [1] b;
}

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 use the return statement.

The return statement sends the result back to where the function was called. Using + adds the two numbers.

2fill in blank

medium

Complete the code to return the length of the string.

Javascript

function getLength(str) {
  return str[1];
}

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

A.length

B.size

C.length()

D.count

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses like a function call.

Using properties that don't exist like .size or .count.

In JavaScript, strings have a length property (without parentheses) that gives the number of characters.

3fill in blank

hard

Fix the error in the function to correctly return the square of a number.

Javascript

function square(num) {
  [1] num * num;
}

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

Aconsole.log

Bprint

Creturn

Doutput

Attempts:

3 left

💡 Hint

Common Mistakes

Using console.log instead of return.

Not returning anything, so the function returns undefined.

The function must use return to send the result back. console.log only prints to the console but does not return a value.

4fill in blank

hard

Fill both blanks to create a function that returns true if a number is even.

Javascript

function isEven(num) {
  return num [1] 2 [2] 0;
}

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

A%

B==

C===

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment = instead of comparison.

Using loose equality == instead of strict equality ===.

The modulo operator % gives the remainder. If num % 2 === 0, the number is even.

5fill in blank

hard

Fill both blanks to return an object with the uppercase key and its length as value for a given word.

Javascript

function wordInfo(word) {
  return { [1]: : [2] };
}

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

Aword.toUpperCase()

Bword.length

C*

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication * instead of colon : in object.

Not calling toUpperCase() as a function.

The function returns an object with a key and value. The key is the uppercase word, then a colon :, then the length of the word as the value.