Constructor: Redirecting constructors

Redirecting constructors

Sometimes a constructor’s only purpose is to redirect to another constructor in the same class.

A redirecting constructor’s body is empty, with the constructor call appearing after a colon (:). 

class Point { 
   num x, y; 

   // The main constructor for this class. 
   Point(this.x, this.y); 

   // Delegates to the main constructor. 
   Point.alongXAxis(num x) : this(x, 0); 
}

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Redirecting constructors

Constructor: Redirecting constructors — Structure map

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