Comparing multiple strings in If

A bit of a noob question here. I'm wanting to check what viewport the user is in using an if statement.

So:

currentView = (viewport.getType() as string)
if currentView == "view_top" then
(
THINGS!
)

Which is fine, so I wanted to check if the condition is true for multiple views using:

if currentView == "view_front" or "view_left" then
(
THINGS!
)

But it does not work. I've been trying to search how but using "or" within Google search strings isn't that helpful.

Any help would be awesome!