9.10 Variable Numbers of Function Parameters
It is not always possible to know in advance the number of parameters a function will need to accept when it is called within application code. Swift handles this possibility through the use of variadic parameters. Variadic parameters are declared using three periods (…) to indicate that the function accepts zero or more parameters of a specified data type. Within the body of the function, the parameters are made available in the form of an array object. The following function, for example, takes as parameters a variable number of String values and then outputs them to the console panel:
func displayStrings(_ strings: String...)
{
for string in strings {
print(string)
}
}
displayStrings("one", "two", "three", "four")
