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copied!<p>This works as well, and is perhaps closer to the original:</p> <pre><code>class Class1 { id:number; constructor(s: string) { (n:number) => { this.id = n; }(s.length) } } var t:Class1 = new Class1("HELLO"); console.log("Class1ID: " + t.id); // Output = Class1 ID: 5 </code></pre> <p>For reference, here's the output JS:</p> <pre><code>var Class1 = (function () { function Class1(s) { var _this = this; (function (n) { _this.id = n; })(s.length); } return Class1; })(); var t = new Class1("HELLO"); console.log("Class1 ID: " + t.id); </code></pre> <p><strong>Update</strong></p> <p>If you have to be able to call the constructor with just an ID, then I think you'll have to use a factory method, as Steve has suggested. And, since I don't think TS constructors can be private, if you need that method to be private you'll have to dispense with the constructor altogether and use a pair of factory methods. The first instance might look something like this:</p> <pre><code>class Class1 { constructor(public id:number) {} // Public, unfortunately. static Fabricate(s:string):Class1 { return new Class1(s.length); } } var classA:Class1 = new Class1(1); var classB:Class1 = Class1.Fabricate("Hello"); console.log(classA.id); // "1" console.log(classB.id); // "5" </code></pre> <p>And the second something like this:</p> <pre><code>class Class1 { id:number; private static fabricate(n:number):Class1 { var class1:Class1 = new Class1(); class1.id = n; return class1; } static Fabricate(s:string):Class1 { return fabricate(s.length); } } var classA:Class1 = Class1.Fabricate("Hello"); console.log(classA.id); // "5" </code></pre>

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