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javascript singleton class
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| // const Singleton = (function() { | |
| // var _instance; | |
| // function init() { | |
| // var privateProperty = "private " + Math.floor(Math.random() * 100); | |
| // function privateMethod() { | |
| // console.log(privateProperty); | |
| // } | |
| // return { | |
| // publicProperty: "public " + Math.floor(Math.random() * 100), | |
| // publicMethod: function() { | |
| // console.log("public"); | |
| // privateMethod(); | |
| // } | |
| // } | |
| // } | |
| // return { | |
| // getInstance: function() { | |
| // if ( !_instance ) { | |
| // _instance = init() | |
| // } | |
| // return _instance; | |
| // } | |
| // } | |
| // })(); | |
| class Singleton { | |
| static #instance; | |
| publicProperty = "public " + Math.floor(Math.random() * 100); | |
| #privateProperty = "private " + Math.floor(Math.random() * 100); | |
| constructor() { | |
| if (Singleton.#instance != null) { | |
| return Singleton.#instance; | |
| } | |
| Singleton.#instance = this; | |
| } | |
| #privateMethod = function () { | |
| console.log(this.#privateProperty); | |
| } | |
| publicMethod() { | |
| console.log("public"); | |
| this.#privateMethod(); | |
| } | |
| static getInstance() { | |
| if (Singleton.#instance != null) { | |
| return Singleton.#instance; | |
| } | |
| return Singleton.#instance = new Singleton(); | |
| } | |
| } | |
| var sing = Singleton.getInstance(); | |
| sing.publicMethod(); | |
| // var sing1 = Singleton.getInstance(); | |
| var sing1 = new Singleton(); | |
| sing1.publicMethod(); | |
| if (sing.publicProperty === sing1.publicProperty) { | |
| console.log(true); | |
| } else { | |
| console.log(false); | |
| } |
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