ISBN13 check digit: Difference between revisions
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=={{header|langur}}==
In this example, we map to multiple functions (actually 1 no-op).
<syntaxhighlight lang="langur">val .isbn13checkdigit =
.s = replace(.s, RE/[\- ]/)
.s -> re/^[0-9]{13}$/ and
fold(f{+}, map [_,
}
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