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clarification: not EventEmitter but its instance #20537

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clarification: not EventEmitter but its instance #20537

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clarification: not EventEmitter but its instance
dagolinuxoid May 5, 2018
911cee4
Update events.md
dagolinuxoid May 8, 2018
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10 changes: 5 additions & 5 deletions doc/api/events.md
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Expand Up @@ -44,21 +44,21 @@ myEmitter.emit('event');
## Passing arguments and `this` to listeners

The `eventEmitter.emit()` method allows an arbitrary set of arguments to be
passed to the listener functions. It is important to keep in mind that when an
ordinary listener function is called by the `EventEmitter`, the standard `this`
keyword is intentionally set to reference the `EventEmitter` to which the
passed to the listener functions. It is important to keep in mind that when
an ordinary listener function is called, the standard `this` keyword
is intentionally set to reference the `EventEmitter` instance to which the
listener is attached.

```js
const myEmitter = new MyEmitter();
myEmitter.on('event', function(a, b) {
console.log(a, b, this);
console.log(a, b, this, this === myEmitter);
// Prints:
// a b MyEmitter {
// domain: null,
// _events: { event: [Function] },
// _eventsCount: 1,
// _maxListeners: undefined }
// _maxListeners: undefined } true
});
myEmitter.emit('event', 'a', 'b');
```
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