Whether the switch can judge the expression unset Topic is solved

[cgx5871]

Code: Select all

a()
a(b?){
	Switch b
	{
	Case unset(b):
		MsgBox "unset"

	Case 1:
		MsgBox 1
	}
}

[mikeyww]

Code: Select all

#Requires AutoHotkey v2.0
c := 3
a()
a(c)

a(b?){
 Switch {
  Case IsSet(b):
   MsgBox "Set"
  Default:
   MsgBox "Unset"
 }
}

Explained: Unset parameters • Switch

If present, SwitchValue is evaluated once and compared to each case value until a match is found, and then that case is executed. Otherwise, the first case which evaluates to true (non-zero and non-empty) is executed. If there is no matching case and a Default is present, it is executed.

[neogna2]

or

Code: Select all

  Case !IsSet(b):
   MsgBox "Unset"