String: Difference between revisions
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Some users of [[Nested array model|nested]] APLs have proposed a dedicated string datatype to allow strings to be manipulated as a single entity, and in particular, to allow them to be compared with [[scalar functions]]. In [[Flat array model|flat]] APLs these problems are not felt so strongly because [[Box|boxed]] arrays behave more like a simple datatype. | Some users of [[Nested array model|nested]] APLs have proposed a dedicated string datatype to allow strings to be manipulated as a single entity, and in particular, to allow them to be compared with [[scalar functions]]. In [[Flat array model|flat]] APLs these problems are not felt so strongly because [[Box|boxed]] arrays behave more like a simple datatype. | ||
== External links == | |||
[https://en.wikipedia.org/wiki/String_(programming) Wikipedia] | |||
Revision as of 13:18, 30 October 2019
In APL, a string is a vector of characters. Strings are written using single quotes, for example 'string'.
A single character in quotes, such as 'a', creates a scalar character rather than a string. To create a singleton string the ravel function is typically used, as in ,'a'. Ravelling a quoted literal always produces a string. This consideration only applies to exactly one character (or two quotes representing a single character, as described in the next paragraph); quotes with no characters between them ('') form an empty string.
APL's string notation is very simple and includes only one escape: two adjacent single quotes within a string stand for one single quote character rather than ending the string and starting a new one. To strand strings together, put spaces between them. A newline character within a string produces an error. To produce newlines or other non-printing characters which would be inconvenient to include in the source, use an alternative character creation mechanism, such as ⎕UCS.
Some users of nested APLs have proposed a dedicated string datatype to allow strings to be manipulated as a single entity, and in particular, to allow them to be compared with scalar functions. In flat APLs these problems are not felt so strongly because boxed arrays behave more like a simple datatype.