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Add Eventing

Background

Event listeners are an important feature of asynchronous software.

They allow us to separate our JavaScript logic from the HTML markup, run callbacks based on things like user interactions and page loading, make it easier to control how events react to bubbling, and can be used even when we do not control the HTML markup.

Adding Custom Event Listeners

Make an addEventing mix-in that adds .on() and .trigger() methods to an object.

Example:

const obj = addEventing({ name: 'John', age: 35 })

obj.on('ageChange', function () {
  console.log('age changed')
})

obj.trigger('ageChange') // logs 'age changed'

Requirements:

  • addEventing should return an object with on and trigger as additionally added properties
  • it should be able to handle multiple callback functions for the same event name
  • if obj.trigger is called with additional arguments it should pass those to the listeners
  • note: we don't need to write a way to remove event listeners

Getting Started

The file you will be editing is add-eventing.js.

The add-eventing-test.js file includes a test suite to run your code against.

Run node add-eventing-test.js to run the test suite in full. As you write code to pass tests, make sure you unskip succeeding tests by changing test.skip to just test.