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Prototype: Difference between revisions
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An array's prototype is based on its first element, so the array <source lang=apl inline>a</source> below has a simple numeric prototype, as does any prefix of <source lang=apl inline>a</source>. This property even applies to empty arrays: the expression <source lang=apl inline>0 ↑ a</source> results in an empty array with the same prototype as <source lang=apl inline>a</source>. | An array's prototype is based on its first element, so the array <source lang=apl inline>a</source> below has a simple numeric prototype, as does any prefix of <source lang=apl inline>a</source>. This property even applies to empty arrays: the expression <source lang=apl inline>0 ↑ a</source> results in an empty array with the same prototype as <source lang=apl inline>a</source>. | ||
<source lang=apl> | <source lang=apl> | ||
⎕←a ← 5 'c' ¯2 | |||
5 c ¯2 | 5 c ¯2 | ||
4 ↑ a | 4 ↑ a | ||
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The prototype of an array may be [[nested]]. Here, we inspect the prototype of an array containing both character and numeric data. In the prototype, all characters are converted to spaces and all numbers to zeros. Thus the prototype retains type and structure information but not specific values. | The prototype of an array may be [[nested]]. Here, we inspect the prototype of an array containing both character and numeric data. In the prototype, all characters are converted to spaces and all numbers to zeros. Thus the prototype retains type and structure information but not specific values. | ||
<source lang=apl> | <source lang=apl> | ||
⎕←x ← ⊂'de'(3 4 5) ⍝ A complicated scalar array | |||
┌──────────┐ | ┌──────────┐ | ||
│┌──┬─────┐│ | │┌──┬─────┐│ | ||
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APLs with a [[flat array model]] do not typically store prototype information, instead using only the array's type ([[character]], [[numeric]], or [[Box|boxed]]) to determine its [[Fill element|fills]]. | APLs with a [[flat array model]] do not typically store prototype information, instead using only the array's type ([[character]], [[numeric]], or [[Box|boxed]]) to determine its [[Fill element|fills]]. | ||
{{APL features}} | {{APL features}}[[Category:Array relationships]][[Category:Array characteristics]] | ||