Created
April 10, 2018 15:08
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eventEmitter.js
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| class EventEmitter { | |
| constructor(eventMap = new Map()) { | |
| this.eventMap = eventMap | |
| } | |
| addEventListener(event, handler) { | |
| if(this.eventMap.has(event)) { | |
| this.eventMap.set(event, this.eventMap.get(event).concat([handler])) | |
| }else { | |
| this.eventMap.set(event, [handler]) | |
| } | |
| } | |
| dispatchEvent(event) { | |
| if(this.eventMap.has(event)) { | |
| const handlers = this.eventMap.get(event) | |
| for(const i in handlers) { | |
| handlers[i]() | |
| } | |
| } | |
| } | |
| } | |
| export default EventEmitter |
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