Dir Functions, Need Some Help With My Derp

Hello, I've bumped into a problem I hope to get solved..
It doesn't give me an error code or anything but I just wanted to know how this works..

local rDir = shell.dir() --This is the default folder
shell.setDir("SomeDir") -- Sets it to the dir I want
if fs.isDir(shell.resolve(".").."SomeOtherDir") then print("It was a dir!") end -- Checks if the dir inside the dir is a dir(Wow.. That was alot of dir)

NOTE: This isn't the exact code I'm using, Just a similiar to it

So the problem is that "SomeOtherDir" is a folder and it doesn't print that.. I have tested using shell.dir() also.
So how would I check if the dir inside a dir is a dir?

shell.resolve(".") should return "SomeDir" and you concatenated that with "SomeOtherDir" to make "SomeDirSomeOtherDir".

Use fs.combine(shell.resolve("."), "SomeOtherDir") to make "SomeDir/SomeOtherDir" and then it should work.

Or just use:

shell.resolve("SomeOtherDir")

That should return the same as:

fs.combine(shell.dir(), "SomeOtherDir")

Thanks to you both, I wasn't really sure of how shell.resolve worked exactly.. But it works now, And I'll probably use shell.resolve. But both was helpful.