therealbnut/PeekSequence

A Swift Sequence (allows consumable sequences) that you can peek values from.

Defines a new sequence type PeekSequence, that can peek at its first value.

Also defines a top level function nonEmptySequence() that returns AnySequence if a sequence has values, nil otherwise.

Example:
let values: [Int] = [1,2,3,4]
if let sequence = nonEmptySequence(values) {
   for element in sequence {
       print("element: \(element)")
   }
}
else {
   print("empty!")
}