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|<code>⊃</code> <code>↑</code> | |<code>⊃</code> <code>↑</code> | ||
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'''First''' (<code>⊃</code> or <code>↑</code> and also called '''Disclose''') is a [[monadic function]] in [[Nested array model|nested]] APLs which extracts the first [[element]] in [[ravel order]] from its argument, or, if the argument is [[empty]], returns its [[prototype]]. The [[glyph]] used varies by dialect. In a [[Nested array model|nested]] APL, First reduces the positive [[depth]] of an argument other than a [[simple scalar]] by at least one; in a [[Flat array model|flat]] APL it does not change the depth. A flat array language may also use the [[Head]] function to get the first [[major cell]] of its argument rather than the first 0-[[cell]]. In this case First can be obtained by [[take|taking]] the Head of the [[Ravel]] of the argument. | '''First''' (<code>⊃</code> or <code>↑</code> and also called '''[[Disclose]]''') is a [[monadic function]] in [[Nested array model|nested]] APLs which extracts the first [[element]] in [[ravel order]] from its argument, or, if the argument is [[empty]], returns its [[prototype]]. The [[glyph]] used varies by dialect. In a [[Nested array model|nested]] APL, First reduces the positive [[depth]] of an argument other than a [[simple scalar]] by at least one; in a [[Flat array model|flat]] APL it does not change the depth. A flat array language may also use the [[Head]] function to get the first [[major cell]] of its argument rather than the first 0-[[cell]]. In this case First can be obtained by [[take|taking]] the Head of the [[Ravel]] of the argument. | ||
== External links == | == External links == | ||
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=== Documentation === | === Documentation === | ||
* [https://help.dyalog.com/18.0/#Language/Primitive%20Functions/Disclose.htm Dyalog] | * [https://help.dyalog.com/18.0/#Language/Primitive%20Functions/Disclose.htm Dyalog] (<syntaxhighlight lang=apl inline>⊃</syntaxhighlight>) | ||
* [http://microapl.com/apl_help/ch_020_020_550.htm APLX] | * [http://microapl.com/apl_help/ch_020_020_550.htm APLX] (<syntaxhighlight lang=apl inline>↑</syntaxhighlight>) | ||
* [https://mlochbaum.github.io/BQN/doc/pick.html#first BQN] | |||
== See also == | |||
* [[Mix]] | |||
* [[Right Shoe]] | |||
{{APL built-ins}}[[Category:Primitive functions]] | {{APL built-ins}}[[Category:Primitive functions]] | ||