https://github.com/mahabubx7/evented-thing-py

https://github.com/mahabubx7/evented-thing-py

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• Host: GitHub
• URL: https://github.com/mahabubx7/evented-thing-py
• Owner: mahabubx7
• Created: 2024-03-23T06:15:14.000Z (8 months ago)
• Default Branch: main
• Last Pushed: 2024-03-23T06:19:18.000Z (8 months ago)
• Last Synced: 2024-03-23T07:27:48.987Z (8 months ago)
• Language: Python
• Size: 4.88 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Evented Thing | Python

### Source Code | Solution

```python

class EventedThing:

  def __init__(self) -> None:

    self.events = {} # storage hashmap for events

  def on(self, event: str, callback: callable) -> None:

    if event in self.events: # Check if event already exists

      self.events[event].append(callback) # Append callback to the event

    else:

      self.events[event] = [callback] # Create a new event with the callback

  def trigger(self, event: str, *args) -> None:

    if event in self.events: # Check if event exists

      for callback in self.events[event]: # Loop through all callbacks

        callback(*args) # Call the callback with arguments

```

### Sample Test Cases

```python

import unittest # using unit-test lib

# Test suit with its test cases

class TestEventedThing(unittest.TestCase):

  def test_on(self) -> None:

    event = EventedThing()

    def callback():

      print("Event Triggered!")

    event.on("click", callback)

    self.assertEqual(event.events, {"click": [callback]})

  def test_trigger(self) -> None:

    event = EventedThing()

    count = 0

    def callback():

      nonlocal count

      count += 1

    event.on("click", callback)

    event.trigger("click")

    print(count)

    self.assertEqual(count, 1)

  def test_meet_event(self):

    passed_args = []

    event = EventedThing()

        

    def callback(*args):

        nonlocal passed_args

        passed_args = list(args)

        

    event.on('meet', callback)

        

    # Triggering 'meet' event with one argument

    event.trigger('meet', 'arg1')

    self.assertEqual(passed_args, ['arg1'])

        

    # Triggering 'meet' event with two arguments

    event.trigger('meet', 'arg1', 'arg2')

    self.assertEqual(passed_args, ['arg1', 'arg2'])

if __name__ == "__main__":

  unittest.main()

```