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April 20, 2017 18:03
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JS Bin Observer parttern // source https://jsbin.com/jabebad
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta name="description" content="Observer parttern"> | |
<meta charset="utf-8"> | |
<title>JS Bin</title> | |
</head> | |
<body> | |
<script id="jsbin-javascript"> | |
/* | |
Observer pattern is used when there is one-to-many relationship between objects such as if one object is modified, its depenedent objects are to be notified automatically. Observer pattern falls under behavioral pattern category. | |
*/ | |
'use strict'; | |
var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } }; | |
var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })(); | |
function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; } | |
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } } | |
var Subject = (function () { | |
function Subject() { | |
_classCallCheck(this, Subject); | |
} | |
_createClass(Subject, [{ | |
key: 'attach', | |
value: function attach(observer) { | |
console.log('observer attach'); | |
this.observers.push(observer); | |
} | |
}, { | |
key: 'dettach', | |
value: function dettach(observer) { | |
for (var i in this.observers) { | |
if (this.observers[i] === observer) { | |
this.observers.splice(i, 1); | |
} | |
} | |
} | |
}, { | |
key: 'notify', | |
value: function notify() { | |
console.log('observer notify'); | |
for (var i in this.observers) { | |
this.observers[i].update(this); | |
} | |
} | |
}]); | |
return Subject; | |
})(); | |
var ConcreteSubject = (function (_Subject) { | |
_inherits(ConcreteSubject, _Subject); | |
function ConcreteSubject() { | |
_classCallCheck(this, ConcreteSubject); | |
_get(Object.getPrototypeOf(ConcreteSubject.prototype), 'constructor', this).call(this); | |
this.subjectState = null; | |
this.observers = []; | |
console.log('ConcreteSubject create'); | |
} | |
_createClass(ConcreteSubject, [{ | |
key: 'getState', | |
value: function getState() { | |
return this.subjectState; | |
} | |
}, { | |
key: 'setState', | |
value: function setState(state) { | |
this.subjectState = state; | |
this.notify(); | |
} | |
}]); | |
return ConcreteSubject; | |
})(Subject); | |
var Observer = (function () { | |
function Observer() { | |
_classCallCheck(this, Observer); | |
} | |
_createClass(Observer, [{ | |
key: 'update', | |
value: function update() {} | |
}]); | |
return Observer; | |
})(); | |
var ConcreteObserver = (function (_Observer) { | |
_inherits(ConcreteObserver, _Observer); | |
function ConcreteObserver() { | |
_classCallCheck(this, ConcreteObserver); | |
_get(Object.getPrototypeOf(ConcreteObserver.prototype), 'constructor', this).call(this); | |
this.observerState = ''; | |
console.log('ConcreteObserver create'); | |
} | |
_createClass(ConcreteObserver, [{ | |
key: 'update', | |
value: function update(Subject) { | |
this.observerState = Subject.getState(); | |
console.log('Observer new state: ' + this.observerState); | |
} | |
}]); | |
return ConcreteObserver; | |
})(Observer); | |
function test() { | |
var observer1 = new ConcreteObserver(); | |
var observer2 = new ConcreteObserver(); | |
var subject = new ConcreteSubject(); | |
} | |
test(); | |
</script> | |
<script id="jsbin-source-javascript" type="text/javascript">/* | |
Observer pattern is used when there is one-to-many relationship between objects such as if one object is modified, its depenedent objects are to be notified automatically. Observer pattern falls under behavioral pattern category. | |
*/ | |
class Subject { | |
constructor() { | |
} | |
attach(observer) { | |
console.log('observer attach'); | |
this.observers.push(observer); | |
} | |
dettach(observer) { | |
for(let i in this.observers) { | |
if(this.observers[i] === observer) { | |
this.observers.splice(i, 1); | |
} | |
} | |
} | |
notify() { | |
console.log('observer notify'); | |
for(let i in this.observers) { | |
this.observers[i].update(this); | |
} | |
} | |
} | |
class ConcreteSubject extends Subject { | |
constructor() { | |
super(); | |
this.subjectState = null; | |
this.observers = []; | |
console.log('ConcreteSubject create'); | |
} | |
getState() { | |
return this.subjectState; | |
} | |
setState(state) { | |
this.subjectState = state; | |
this.notify(); | |
} | |
} | |
class Observer { | |
constructor() {} | |
update() { | |
} | |
} | |
class ConcreteObserver extends Observer { | |
constructor() { | |
super(); | |
this.observerState = ''; | |
console.log('ConcreteObserver create'); | |
} | |
update(Subject) { | |
this.observerState = Subject.getState(); | |
console.log('Observer new state: ' + this.observerState); | |
} | |
} | |
function test() { | |
const observer1 = new ConcreteObserver(); | |
const observer2 = new ConcreteObserver(); | |
const subject = new ConcreteSubject(); | |
} | |
test();</script></body> | |
</html> |
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/* | |
Observer pattern is used when there is one-to-many relationship between objects such as if one object is modified, its depenedent objects are to be notified automatically. Observer pattern falls under behavioral pattern category. | |
*/ | |
'use strict'; | |
var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } }; | |
var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })(); | |
function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; } | |
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } } | |
var Subject = (function () { | |
function Subject() { | |
_classCallCheck(this, Subject); | |
} | |
_createClass(Subject, [{ | |
key: 'attach', | |
value: function attach(observer) { | |
console.log('observer attach'); | |
this.observers.push(observer); | |
} | |
}, { | |
key: 'dettach', | |
value: function dettach(observer) { | |
for (var i in this.observers) { | |
if (this.observers[i] === observer) { | |
this.observers.splice(i, 1); | |
} | |
} | |
} | |
}, { | |
key: 'notify', | |
value: function notify() { | |
console.log('observer notify'); | |
for (var i in this.observers) { | |
this.observers[i].update(this); | |
} | |
} | |
}]); | |
return Subject; | |
})(); | |
var ConcreteSubject = (function (_Subject) { | |
_inherits(ConcreteSubject, _Subject); | |
function ConcreteSubject() { | |
_classCallCheck(this, ConcreteSubject); | |
_get(Object.getPrototypeOf(ConcreteSubject.prototype), 'constructor', this).call(this); | |
this.subjectState = null; | |
this.observers = []; | |
console.log('ConcreteSubject create'); | |
} | |
_createClass(ConcreteSubject, [{ | |
key: 'getState', | |
value: function getState() { | |
return this.subjectState; | |
} | |
}, { | |
key: 'setState', | |
value: function setState(state) { | |
this.subjectState = state; | |
this.notify(); | |
} | |
}]); | |
return ConcreteSubject; | |
})(Subject); | |
var Observer = (function () { | |
function Observer() { | |
_classCallCheck(this, Observer); | |
} | |
_createClass(Observer, [{ | |
key: 'update', | |
value: function update() {} | |
}]); | |
return Observer; | |
})(); | |
var ConcreteObserver = (function (_Observer) { | |
_inherits(ConcreteObserver, _Observer); | |
function ConcreteObserver() { | |
_classCallCheck(this, ConcreteObserver); | |
_get(Object.getPrototypeOf(ConcreteObserver.prototype), 'constructor', this).call(this); | |
this.observerState = ''; | |
console.log('ConcreteObserver create'); | |
} | |
_createClass(ConcreteObserver, [{ | |
key: 'update', | |
value: function update(Subject) { | |
this.observerState = Subject.getState(); | |
console.log('Observer new state: ' + this.observerState); | |
} | |
}]); | |
return ConcreteObserver; | |
})(Observer); | |
function test() { | |
var observer1 = new ConcreteObserver(); | |
var observer2 = new ConcreteObserver(); | |
var subject = new ConcreteSubject(); | |
} | |
test(); |
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