Blank parameter error Topic is solved

[helming]

Hello, guys

Code: Select all

MyFunc(1,, 3)
MyFunc(X, Y:=2, Z:=0) {  ; Note that Z must still be optional in this case.
    MsgBox %X%, %Y%, %Z%
}

This is a sample code from https://www.autohotkey.com/docs/Functions.htm

It works fine.

Code: Select all

f7::MyFunc(1,5, )
MyFunc(X, Y:=2, Z:=0) {  ; Note that Z must still be optional in this case.
    MsgBox %X%, %Y%, %Z%
}

This script cause a error of blank parameter.
Third parameter(Z) is optional parameter like second parameter(Y), so why is it a problem?

[mikeyww]

Code: Select all

F7::MyFunc(1,5)

[Pepineros]

If you want to use the default value of the 2nd parameter but specify the 3rd, you need to let ahk know that explicitly by leaving one argument empty.
If you want to use the default value of the 3rd parameter you should omit it entirely, i.e. not place a comma after the 2nd argument when calling.

One of many inconsistencies in AHK but they're the things that make the language so lovable!

[mikeyww]

Thanks for explaining it (my neglect)!

[helming]

All right, I can see now!

Thank you Pepineros, and Mikey!