a small question about scripting logic

[MURTUMA]

Is it possible of how it is possible to use IF operator like this: if ("xx" OR "yy AND zz"?

Either only xx should be true or both yy and zz. I have trouble finding correct syntax.

[colabi]

if (xx OR (zz AND yy) == true)?

[jarlerb]

If xx, yy and zz has the value true or false:
if (xx || (yy && zz))
else:
if (xx== "something" || (yy =="something" && zz=="something"))

Regards, Jarle