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== Close composition == | == Close composition == | ||
In [[SHARP APL]] and [[J]], Under is implemented as a [[close composition]], meaning that (using SHARP syntax) <source lang=apl inline>f¨g</source> has the overall [[function rank]] of <source lang=apl inline>g</source>. J uses <code>&.</code> for the close form and <code>&.:</code> for the rankless form. | In [[SHARP APL]] and [[J]], Under is implemented as a [[close composition]], meaning that (using SHARP syntax) <source lang=apl inline>f¨g</source> has the overall [[function rank]] of <source lang=apl inline>g</source>. This allows <code>¨></code> to serve the purpose of [[Each]] from a [[Nested array model|nested]] APL. J uses <code>&.</code> for the close form and <code>&.:</code> for the rankless form. | ||
== History == | == History == | ||