Instance Method

prefix(while:)

Returns a subsequence containing the initial elements until predicate returns false and skipping the remaining elements.

Declaration

func prefix(while predicate: ((key: Key, value: Value)) throws -> Bool) rethrows -> Slice<Dictionary<Key, Value>>

Parameters

predicate

A closure that takes an element of the sequence as its argument and returns true if the element should be included or false if it should be excluded. Once the predicate returns false it will not be called again.

Discussion

Complexity: O(n), where n is the length of the collection.

See Also

Selecting Elements

subscript(Range<Dictionary<Key, Value>.Index>) -> Slice<Dictionary<Key, Value>>

Accesses a contiguous subrange of the collection’s elements.

subscript<R>(R) -> Slice<Dictionary<Key, Value>>

Accesses the contiguous subrange of the collection’s elements specified by a range expression.

subscript((UnboundedRange_) -> ()) -> Slice<Dictionary<Key, Value>>
func prefix(Int) -> Slice<Dictionary<Key, Value>>

Returns a subsequence, up to the specified maximum length, containing the initial elements of the collection.

func prefix(through: Dictionary<Key, Value>.Index) -> Slice<Dictionary<Key, Value>>

Returns a subsequence from the start of the collection through the specified position.

func prefix(upTo: Dictionary<Key, Value>.Index) -> Slice<Dictionary<Key, Value>>

Returns a subsequence from the start of the collection up to, but not including, the specified position.

func suffix(Int) -> Slice<Dictionary<Key, Value>>

Returns a subsequence, up to the given maximum length, containing the final elements of the collection.

func suffix(from: Dictionary<Key, Value>.Index) -> Slice<Dictionary<Key, Value>>

Returns a subsequence from the specified position to the end of the collection.