Hands-On Design Patterns and Best Practices with Julia

Accepting variable numbers of arguments

Sometimes, it is more convenient if the function can just accept any number of arguments. In this case, we can add three dots ... to a function argument and Julia will automatically roll up all passed arguments into a single variable. This feature is known as slurping.

Here is an example:

# Shoot any number of targetsfunction shoot(from::Widget, targets::Widget...)    println("Type of targets: ", typeof(targets))    for target in targets        println(from.name, " --> ", target.name)    endend

In the shoot function, we first print the type of the targets variable and then print every shot that was fired. Let's set up the game pieces first:

spaceship = Widget("Spaceship", Position(0, 0), Size(30,30))target1 = asteroids[1] ...