Why dApps need user interfaces in Blockchain / Solidity - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display a simple message in a dApp UI.

Blockchain / Solidity

console.log([1]);

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

A"Welcome to the dApp!"

BWelcome to the dApp!

Cconsole.log

Dalert

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the message text.

The message must be a string inside quotes to display correctly in console.log.

2fill in blank

medium

Complete the code to create a button element in HTML for a dApp UI.

Blockchain / Solidity

<button>[1]</button>

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

Asubmit

B<button>

Cdiv

DClick me

Attempts:

3 left

💡 Hint

Common Mistakes

Putting HTML tags inside the button instead of text.

The button text should be inside the button tags as plain text.

3fill in blank

hard

Fix the error in the JavaScript code that updates a dApp UI element.

Blockchain / Solidity

document.getElementById('status').[1] = 'Connected';

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

AinnerHTML

Bvalue

Cconsole

DgetElementById

Attempts:

3 left

💡 Hint

Common Mistakes

Using value instead of innerHTML for div or span elements.

To change the visible text inside an HTML element, use innerHTML property.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps words to their lengths only if length is greater than 3.

Blockchain / Solidity

{word: [1] for word in words if [2] > 3}

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

Alen(word)

Bword

Dword.length

Attempts:

3 left

💡 Hint

Common Mistakes

Using word instead of len(word) for length.

Use len(word) to get the length of each word for both the value and the condition.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase keys to values only if value is positive.

Blockchain / Solidity

result = [1]: [2] for k, v in data.items() if [3] > 0

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

Ak.upper()

Bv

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using k instead of k.upper() for keys.

Checking k instead of v in condition.

Use k.upper() for uppercase keys, v for values, and check if v > 0.