File extension is in extensions list: Difference between revisions
→{{header|J}}: Update for task changes
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=={{header|J}}==
'''Solution:'''
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isExt=: e.~&:(tolower&.>) getExt&.>@boxopen</lang>
'''Usage:'''
<lang j> Exts=: <@('.'&,);._1 '
TestFiles=: <;._1 '
Exts isExt TestFiles
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=={{header|Java}}==
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