Difference between revisions of "Isa"
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== isa (operator) == | == isa (operator) == | ||
<c>isa</c> is a [[:Category:Keywords|keyword]] binary [[operators|operator]] which tests the left-hand operator for membership in the type defined by the right-hand side. That right-hand operator could be a user-defined map (to which the left-hand side might belong via the <c>__isa</c> chain), or it could be one of the [[:Category:Data Types|built-in types]]: [[number]], [[string]], [[list]], [[map]], or [[funcRef]]. | <c>isa</c> is a [[:Category:Keywords|keyword]] binary [[operators|operator]] which tests the left-hand operator for membership in the type defined by the right-hand side. That right-hand operator could be a user-defined map (to which the left-hand side might belong via the <c>__isa</c> chain), or it could be one of the [[:Category:Data Types|built-in types]]: [[number]], [[string]], [[list]], [[map]], or [[funcRef]]. | ||
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| + | === Examples for built-in types === | ||
| + | |||
| + | <ms>"Hello" isa string // returns 1 | ||
| + | "Hello" isa number // returns 0 | ||
| + | 123 isa number // returns 1 | ||
| + | "123" isa number // returns 0 | ||
| + | [1,2,3] isa list // returns 1 | ||
| + | {"uno":1,"dos":2} isa map // returns 1 | ||
| + | </ms> | ||
== __isa (map entry) == | == __isa (map entry) == | ||
Revision as of 08:26, 5 December 2021
Because this wiki software does not allow topic names to begin with an underscore, this page contains two different topics.
isa (operator)
isa is a keyword binary operator which tests the left-hand operator for membership in the type defined by the right-hand side. That right-hand operator could be a user-defined map (to which the left-hand side might belong via the __isa chain), or it could be one of the built-in types: number, string, list, map, or funcRef.
Examples for built-in types
"Hello" isa string // returns 1
"Hello" isa number // returns 0
123 isa number // returns 1
"123" isa number // returns 0
[1,2,3] isa list // returns 1
{"uno":1,"dos":2} isa map // returns 1
__isa (map entry)
__isa is a special entry in a map that refers to the map's base class. It is part of MiniScript's support for object-oriented programming.
See also
- Object-oriented programming in miniscript
- The map type
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