atriusmaps-node-sdk/dist/cjs/src/utils/observable.js

This project provides an API to Atrius Personal Wayfinder maps within a Node environment. See the README.md for more information

'use strict';

function fire(...args) {
  const observers = this._observers;
  if (!observers) {
    return void 0;
  }
  for (let x = 0; x < observers.length; x++) {
    try {
      observers[x].apply(this, args);
    } catch (err) {
      console.error(err);
    }
  }
  return this;
}
function observe(cb) {
  if (!this._observers) {
    this._observers = [];
  }
  this._observers.push(cb);
  return {
    detach: detach.bind(this, cb),
    ob: this
  };
}
function detach(cb) {
  this._observers?.splice(this._observers.indexOf(cb), 1);
}
function filter(fn) {
  const filteredObserver = create();
  this.observe(function(...args) {
    if (fn.apply(this, args)) {
      filteredObserver.fire(...args);
    }
  });
  return filteredObserver;
}
function filterByName(eventName) {
  return filter.call(this, function(name) {
    return eventName === name;
  });
}
function on(value, cb) {
  return filterByName.call(this, value).observe(cb);
}
const observable = { detach, filter, fire, observe, on };
function extend(to, from) {
  return Object.assign(to, from);
}
function create(ob) {
  if (ob) {
    return extend(ob, observable);
  }
  return Object.create(observable);
}

module.exports = create;