HowProgrammingWorks
diff --git a/‎JavaScript/1-simple.js
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+9Lines changed: 9 additions & 0 deletions b/‎JavaScript/1-simple.js
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+9Lines changed: 9 additions & 0 deletions
diff --git a/‎JavaScript/2-safe.js
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+8Lines changed: 8 additions & 0 deletions b/‎JavaScript/2-safe.js
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+8Lines changed: 8 additions & 0 deletions
diff --git a/‎JavaScript/3-complex.js
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+16Lines changed: 16 additions & 0 deletions b/‎JavaScript/3-complex.js
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+16Lines changed: 16 additions & 0 deletions
@@ -0,0 +1,9 @@
+'use strict';
+
+function Singleton() {
+  const instance = Singleton.instance;
+  if (instance) return instance;
+  Singleton.instance = this;
+}
+
+console.assert(new Singleton() === new Singleton());
@@ -0,0 +1,8 @@
+'use strict';
+
+const Singleton = new (function() {
+  const single = this;
+  return function() { return single; };
+})();
+
+console.assert(new Singleton() === new Singleton());
@@ -0,0 +1,16 @@
+'use strict';
+
+const Singleton = (function() {
+  let instance;
+
+  function Singleton() {
+    if (instance) return instance;
+    instance = this;
+  }
+
+  Singleton.prototype.test = function() {};
+
+  return Singleton;
+})();
+
+console.assert(new Singleton() === new Singleton());