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: (UInt8) throws -> Bool) rethrows -> Data

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 Bytes

func filter((UInt8) -> Bool) -> Data

Returns a new collection of the same type containing, in order, the elements of the original collection that satisfy the given predicate.

func prefix(Int) -> Data

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

func prefix(through: Int) -> Data

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

func prefix(upTo: Int) -> Data

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

func suffix(Int) -> Data

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

func suffix(from: Int) -> Data

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