import Foundation

let word = String(repeating: "abcde", count: 200_000) // 1,000,000 characters
let k = 999_999 // Access near the end

// MARK: - String.Index approach
let startIndexMethod = CFAbsoluteTimeGetCurrent()
let index = word.index(word.startIndex, offsetBy: k)
let charFromIndex = word[index]
let endIndexMethod = CFAbsoluteTimeGetCurrent()
let indexDuration = endIndexMethod - startIndexMethod

print("Character using String.Index: \(charFromIndex)")
print("Time using String.Index: \(indexDuration) seconds")

// MARK: - Array(word)[k] approach
let startArrayMethod = CFAbsoluteTimeGetCurrent()
let arrayWord = Array(word)
let charFromArray = arrayWord[k]
let endArrayMethod = CFAbsoluteTimeGetCurrent()
let arrayDuration = endArrayMethod - startArrayMethod

print("Character using Array: \(charFromArray)")
print("Time using Array(word): \(arrayDuration) seconds")