Class definition in Javascript

defining a class in Jscript
/* Jscript */
/* Class in JavaScript */
var ClassName = (function () {
// Constructor
function ClassName(message) {
this.variable1 = message;
}
// Method
ClassName.prototype.greet = function () {
return "Hello, " + this.variable1;
};
return ClassName;
})();
var greeter = new ClassName("world");
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