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The new operator uses the internal [[Construct]] method, and it basically does the following: Initializes a new native object Sets the internal [[Prototype]] of this object, pointing to the Function prototype property. If the function's prototype property is not an object (a primitive values, such as a Number, String, Boolean, Undefined or Null), Object.prototype is used instead. After. The new keyword in JavaScript can be quite confusing when it is first encountered, as people tend to think that JavaScript is not an object-oriented programming language. What is it? What problems. New does not guarantee heap allocation and simply avoiding new does not guarantee stack allocation. New is always used to allocate dynamic memory, which then has to be freed. By doing the first option, that memory will be automagically freed when scope is lost. Using the new () keyword requires a default constructor to be defined for said class. Without the keyword, trying to class new () will not compile. For instance, the following snippet will not compile. The function will try to return a new instance of the parameter. This is a generic type constraint. See this MSDN article. Update April 1st, 2026 The Beta site is being retired. Update February 27th, 2026 Another post discussing the changes with the Chief Product and Technology Officer is here. Update February 26th. The new () Constraint lets the compiler know that any type argument supplied must have an accessible parameterless--or default-- constructor So it should be, T must be a class, and have an accessible parameterless--or default constructor. 83 new() describes a constructor signature in typescript. What that means is that it describes the shape of the constructor. For instance take new(): T; . You are right it is a type. It is the type of a class whose constructor takes in no arguments. Consider the following examples It is NOT 'bad' to use the new keyword. But if you forget it, you will be calling the object constructor as a regular function. If your constructor doesn't check its execution context then it won't notice that 'this' points to different object (ordinarily the global object) instead of the new instance. Therefore your constructor will be adding properties and methods to the global object. In the specific case of throw, throw new() is a shorthand for throw new Exception(). The feature was introduced in c 9 and you can find the documentation as Target-typed new expressions. As you can see, there are quite a few places where it can be used (whenever the type to be created can be inferred) to make code shorter. The place where I like it the most is for fields/properties: Note that if you declared it var a = new ; and var o = new object();, then there is one difference, former is assignable only to another similar anonymous object, while latter being object, it can be assigned to anything.

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