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This emulates [the section headers in `List` docs](09c1222b28/compiler/builtins/docs/List.roc (L216)).
59 lines
1.6 KiB
Text
59 lines
1.6 KiB
Text
interface Set
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exposes
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[
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Set,
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empty,
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single,
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len,
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insert,
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remove,
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union,
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difference,
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intersection,
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toList,
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fromList,
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walk,
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contains
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]
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imports []
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## A Set is an unordered collection of unique elements.
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Set elem : [ @Set elem ]
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## An empty set.
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empty : Set *
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## Check
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isEmpty : Set * -> Bool
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len : Set * -> Nat
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## Modify
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# TODO: removed `'` from signature because parser does not support it yet
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# Original signature: `add : Set 'elem, 'elem -> Set 'elem`
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## Make sure never to add a *NaN* to a [Set]! Because *NaN* is defined to be
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## unequal to *NaN*, adding a *NaN* results in an entry that can never be
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## retrieved or removed from the [Set].
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add : Set elem, elem -> Set elem
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## Drops the given element from the set.
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# TODO: removed `'` from signature because parser does not support it yet
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# Original signature: `drop : Set 'elem, 'elem -> Set 'elem`
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drop : Set elem, elem -> Set elem
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## Transform
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## Convert each element in the set to something new, by calling a conversion
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## function on each of them. Then return a new set of the converted values.
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##
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## >>> Set.map {: -1, 1, 3 :} Num.negate
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##
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## >>> Set.map {: "", "a", "bc" :} Str.isEmpty
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##
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## `map` functions like this are common in Roc, and they all work similarly.
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## See for example [List.map], `Dict.map`, and [Result.map].
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# TODO: removed `'` from signature because parser does not support it yet
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# Original signature: `map : Set 'elem, ('before -> 'after) -> Set 'after`
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map : Set elem, (before -> after) -> Set after
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