evaluator: Add map builtins has and del
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camh-
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Oct 24, 2022
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Refactor map of no type from EMPTY_MAP to GENERIC_MAP and similarly
refactor array of no type from EMPTY_ARRAY to GENERIC_ARRAY.
We are currently using empty maps `{}` and arrays `[]` of no type as
literals in expressions and assignments and give them a type in a
deferred manner: e.g. [1 2] + [] makes the second array an array of num
only when needed.
We also now allow parameters to be of type GENERC_MAP or GENERIC_ARRAY,
which can can only be used in builtin functions captured in the changes
to the function `assertArgTypes` in parser.go
In a follow up commit we are going to reuse this concept not only as
literal for delayed type binding but also to mark a parameter type
as "generic" map or array. This means a parameter hast to a be map, but
it could be a map of any, num or other types.
This will be useful for discovering invalid types for builtin functions
`has` and `del` when the first parameter passed is not a map.
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Add builtin function `has` for entry existence check in map:
has {a: 1} "a" // true
Add builtin function `del` for entry removal from map:
del {a: 1} "a" // {}
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Add builtin function
delfor entry removal from map:Add builtin function
hasfor entry existence check in map: