Iterating Over Strings P2

Just like we used enumerated() with arrays to get both the index and element, we can do the same with strings. This is useful when you need to know the position of each character while iterating.

let word = "Swift"

for (index, char) in word.enumerated() {
    print("\(index): \(char)")
}
// 0: S
// 1: w
// 2: i
// 3: f
// 4: t

This technique is helpful when building new strings based on character positions. For example, you might want to keep only characters at even indices:

let text = "abcdef"
var result = ""

for (index, char) in text.enumerated() {
    if index % 2 == 0 {
        result += String(char)
    }
}

print(result)  // ace

Notice that we convert char to a String using String(char) before appending it. This is necessary because result is a String, and you cannot directly append a Character to it using the += operator.