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=={{header|langur}}==
=={{header|langur}}==
<syntaxhighlight lang="langur">val .select = f(.entries) {
<syntaxhighlight lang="langur">val .select = impure f(.entries) {
if not isList(.entries): throw "invalid args"
if .entries is not list: throw "invalid args"
if len(.entries) == 0: return ""
if len(.entries) == 0: return ""