CompoundPredicate aims to improve the Predicate system to enable combining multiple predicates after constructing them:
let notTooShort = #Predicate<Book> {
$0.pages > 50
}
let notTooLong = #Predicate<Book> {
$0.pages <= 350
}
let lengthFilter = [notTooShort, notTooShort].conjunction()
// Match Books that are just the right length
let titleFilter = #Predicate<Book> {
$0.title.contains("Swift")
}
// Match Books that contain "Swift" in the title or
// are just the right length
let filter = [lengthFilter, titleFilter].disjunction()The documentation is available here and as Docc archive you can view using Xcode
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Arithmetic (+, -, *, /, %)
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+,-,*PredicateExpressions.Arithmetic -
/PredicateExpressions.FloatDivision -
/PredicateExpressions.IntDivision -
%PredicateExpressions.IntRemainder
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Unary minus
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Range (..., ..<)
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...PredicateExpressions.ClosedRange -
..<PredicateExpressions.Range -
x..<z).contains(y)PredicateExpressions.RangeExpressionContains
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Comparison (<, <=, >, >=, ==, !=)
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<,<=,>,>=PredicateExpressions.Comparison -
==PredicateExpressions.Equal -
!=PredicateExpressions.NotEqual
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Conditionals & Ternary (?:)
PredicateExpressions.Conditional -
Boolean logic (&&, ||, !)
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&&PredicateExpressions.Conjunction -
||PredicateExpressions.Disjunction -
!PredicateExpressions.Negation
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Swift optionals (?, ??, !, flatMap(_:), if-let expressions)
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?,flatMap(_:)PredicateExpressions.OptionalFlatMap -
??,if-letPredicateExpressions.NilCoalesce
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Types (as, as?, as!, is)
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as?PredicateExpressions.ConditionalCast -
as,as!PredicateExpressions.ForceCast
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Sequence operations (allSatisfy(), filter(), contains(), contains(where:), starts(with:), max(), min())
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allSatisfy()PredicateExpressions.SequenceAllSatisfy -
filter()PredicateExpressions.Filter[completion:: 2024-03-10] -
contains()PredicateExpressions.SequenceContains[completion:: 2024-03-10] -
contains(where:)PredicateExpressions.SequenceContainsWhere -
starts(with:)PredicateExpressions.SequenceStartsWith -
min()PredicateExpressions.SequenceMinimum[completion:: 2024-03-10] -
max()PredicateExpressions.SequenceMaximum
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Subscript and member access ([], .)
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[0,1][0]PredicateExpressions.CollectionIndexSubscript -
["a": "b"]["a"]PredicateExpressions.DictionaryKeySubscript -
["a": "b"]["a", defaultValue: "b"]PredicateExpressions.DictionaryKeyDefaultValueSubscript -
obj.someKeyPredicateExpressions.KeyPath
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String comparisons
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contains(_:)PredicateExpressions.CollectionContainsCollection -
localizedStandardContains(_:)PredicateExpressions.StringLocalizedStandardContains -
caseInsensitiveCompare(_:)PredicateExpressions.StringCaseInsensitiveCompare -
localizedCompare(_:)PredicateExpressions.StringLocalizedCompare
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