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Getting a sequence of lines from a Swift string
import Foundation
let text = """
extension String {
var lines: AnySequence<Substring> {
let string = self
return AnySequence { () -> AnyIterator<Substring> in
var offset = string.startIndex
return AnyIterator {
let searchRange = offset..<string.endIndex
guard !searchRange.isEmpty else { return nil }
var substring: Substring?
string.enumerateSubstrings(in: searchRange, options: [.byLines, .substringNotRequired]) { _, line, enclosing, stop in
substring = string[line]
offset = enclosing.upperBound
stop = true
return substring
for line in text.lines {
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