Event filtering in Blockchain / Solidity - Mini Project: Build & Apply

Event Filtering in Blockchain

📋 What You'll Learn

💡 Why This Matters

🌍 Real World

Filtering blockchain events helps developers track specific user activities or transactions efficiently.

💼 Career

Blockchain developers often need to process and filter event logs to build user dashboards or analytics tools.

1

Create the event list

Create a list called events with these exact dictionaries: {'user': '0x123', 'action': 'deposit', 'amount': 100}, {'user': '0x456', 'action': 'withdraw', 'amount': 50}, {'user': '0x123', 'action': 'transfer', 'amount': 30}

Blockchain / Solidity

# Create the list of events
# Your code here

Need a hint?

Use a list with dictionaries exactly as shown.

2

Set the user address to filter

Create a variable called filter_user and set it to the string '0x123'

Blockchain / Solidity

events = [
    {'user': '0x123', 'action': 'deposit', 'amount': 100},
    {'user': '0x456', 'action': 'withdraw', 'amount': 50},
    {'user': '0x123', 'action': 'transfer', 'amount': 30}
]
# Create the filter_user variable
# Your code here

Need a hint?

Set the variable exactly as shown.

3

Filter events by user address

Create a list called filtered_events using a list comprehension that includes only events where event['user'] == filter_user

Blockchain / Solidity

events = [
    {'user': '0x123', 'action': 'deposit', 'amount': 100},
    {'user': '0x456', 'action': 'withdraw', 'amount': 50},
    {'user': '0x123', 'action': 'transfer', 'amount': 30}
]
filter_user = '0x123'
# Filter events by user address
# Your code here

Need a hint?

Use a list comprehension with the condition event['user'] == filter_user.

4

Print the filtered events

Write a print statement to display the filtered_events list

Blockchain / Solidity

events = [
    {'user': '0x123', 'action': 'deposit', 'amount': 100},
    {'user': '0x456', 'action': 'withdraw', 'amount': 50},
    {'user': '0x123', 'action': 'transfer', 'amount': 30}
]
filter_user = '0x123'
filtered_events = [event for event in events if event['user'] == filter_user]
# Print the filtered events
# Your code here

Need a hint?

Use print(filtered_events) to show the filtered list.