How can I trim a variable?

I have an applescript with a variable containing the POSIX path of a file. I would like to assign a variable with the POSIX path of the folder that contains the file.
eg :
pathVariable is "/Users/name/Desktop/file.ext"
then
folderVariable should be "/Users/name/Desktop/"
can anyone think of a way to assign folderVariable within an applescript?
Thanks in advance!

There are a couple of ways to do this - one uses the Finder to get the container (somewhat confusing with POSIX strings since it uses aliases), and the other uses AppleScript's text item delimiters to strip off the end item of the path:
<pre title="this text can be pasted into the Script Editor" style="font-family: Monaco, 'Courier New', Courier, monospace; font-size: 10px; padding: 5px; width: 720px; color: #000000; background-color: #E0E0E0; overflow: auto">set TestFile to POSIX path of ((choose file without invisibles) as string) -- get a POSIX path string
tell application "Finder" to set MyFinderPath to POSIX path of (container of (POSIX file TestFile as alias) as alias)
log "Finder container: " & MyFinderPath
set {TempTID, AppleScript's text item delimiters} to {AppleScript's text item delimiters, "/"}
set MyPosixPath to reverse of (rest of (reverse of text items of TestFile)) & "" as string
set AppleScript's text item delimiters to TempTID
log "Text Item Delimiters: " & MyPosixPath
</pre>

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