14 Day Beginner Challenge (SwiftUI) - Lesson 12 Strange Behavior

General Discussion
2

In this line, you are comparing strings.

The string “card11” (i.e., a Jack) is not greater than the string “card4” because strings are not compared the same as integers.

let playerInt = 11
let cpuInt = 4
print(playerInt > cpuInt)
//prints true

let playerCard = "card11"
let cpuCard = "card4"
print(playerCard > cpuCard)
//prints false

With integers, 11 is obviously greater than 4.

With strings, you aren’t workinng with the numbers 11 and 4, you are working with the characters "11" and "4". Since the character "1" sorts before the character "4", then "11" comes first. Numbers (like Ints) are sorted numerically; strings are sorted lexicographically.

Run this code in a playground and you will see what I mean:

let rng = 1...14

//sorted range of Ints
print(rng.sorted())
//prints [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]

//sorted range of strings
print(rng.map { "\($0)" }.sorted())
//prints ["1", "10", "11", "12", "13", "14", "2", "3", "4", "5", "6", "7", "8", "9"]
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