惰性单例

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惰性单例

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let LazySingle = (() => {
  let instance = null
  function Single() {
    return {
      Method: function () {
        console.log("public method")
      },
      Prototype: "some message",
    }
  }
  return () => {
    if (!instance) instance = Single()
    return instance
  }
})()

// for test
console.log(LazySingle().Prototype)
LazySingle().Method()