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Task/Walk-a-directory-Recursively/LiveCode/walk-a-directory-recursively-1.livecode

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+function recurDir dir, ext
+    set the defaultFolder to dir
+    repeat for each line fi in the files
+        if fileExt(fi) = ext then
+            put the longfilepath of fi & cr after fileList
+        end if
+    end repeat
+    repeat for each line di in the folders
+        if di is not "." and di is not ".." then
+            put recurDir((dir & slash & di), ext)  & cr after fileList
+        end if
+    end repeat
+    filter fileList without empty
+    return fileList
+end recurDir
+
+function fileExt f
+    set the itemdel to "."
+    return the last item of f
+end fileExt

Task/Walk-a-directory-Recursively/LiveCode/walk-a-directory-recursively-2.livecode

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+put recurDir(the home folder & slash & "music", "mp3")