events event driven architecture in node js

Shirshak Kandel answered on October 10, 2022 Popularity 10/10 Helpfulness 1/10

answer events event driven architecture in node js

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events event driven architecture in node js

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In node there are certain objects called event emitter that emit name event that
fire when somethings important happends.It is pick by event listener and attached
to callback function set by devleopers.

Popularity 10/10 Helpfulness 1/10 Language typescript

Source: Grepper

Tags: architecture event-driven events typescript

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Contributed on Oct 10 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

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(() => {
  'use strict';

  class EventEmitter {
    constructor() {
      this.events = new Map();
    }

    on(event, listener) {
      if (typeof listener !== 'function') {
        throw new TypeError('The listener must be a function');
      }
      let listeners = this.events.get(event);
      if (!listeners) {
        listeners = new Set();
        this.events.set(event, listeners); 
      }
      listeners.add(listener);
      return this;
    }

    off(event, listener) {
      if (!arguments.length) {
        this.events.clear();
      } else if (arguments.length === 1) {
        this.events.delete(event);
      } else {
        const listeners = this.events.get(event);
        if (listeners) {
          listeners.delete(listener);
        }
      }
      return this;
    }

    emit(event, ...args) {
      const listeners = this.events.get(event);
      if (listeners) {
        for (let listener of listeners) {
          listener.apply(this, args);
        }
      }
      return this;
    }
  }

  this.EventEmitter = EventEmitter;
})();

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: en.wikipedia.org

Tags: architecture architectu

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Contributed on May 18 2023

Martin Binczak

0 Answers Avg Quality 2/10

events event driven architecture in node js

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