REBOL 3 Functions: suffix?

Description

The SUFFIX? function can be used to obtain the file extention (e.g. .exe, .txt, .jpg, etc.) that is part of a filename.

print suffix? %document.txt
.txt

print suffix? %program.exe
.exe

print suffix? %dir/path/doc.txt
.txt

print suffix? %file.type.r
.r

print suffix? http://www.rebol.com/doc.txt
.txt

If there is no suffix, a NONE is returned:

print suffix? %filename
none

The suffix function can be used with any string datatype, but always returns a FILE! datatype if the suffix was found.

print type? suffix? %file.txt
file!

print type? suffix? "file.txt"
file!

print type? suffix? http://www.rebol.com/file.txt
file!

This was done to allow code such as:

url: http://www.rebol.com/docs.html
if find [%.txt %.html %.htm %.doc] suffix? url [
    print [url "is a document file."]
]
http://www.rebol.com/docs.html is a document file.