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Advanced Programming Techniques in D

Variadic Functions

Explore how to define and use variadic functions in the D programming language. Understand the difference between default parameters and true variadic parameters, how to pass arguments as slices, and the safe approaches to creating functions that accept a variable number of arguments. This lesson helps you design flexible functions that improve code usability and maintainability in D.

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Despite appearances, default parameter values do not change the number of parameters that a function receives. For example, even though some parameters may be assigned their default values, the printAA() function always takes four parameters and uses them according to its implementation:

void printAA(string title, 
             string[string] aa,
             string keySeparator = ": ",
             string elementSeparator = ", ")

On the other hand, variadic functions can be called with an unspecified number of arguments. We have already been taking advantage of ...