Question

How to count the occurrences of each letter in char array with Swift

Answer 1

import Foundation

func countLetterOccurrences(in array: [Character]) -> [Character: Int] {
    var letterCount = [Character: Int]()
    
    for char in array {
        if let count = letterCount[char] {
            letterCount[char] = count + 1
        } else {
            letterCount[char] = 1
        }
    }
    
    return letterCount
}

let charArray: [Character] = ["s", "w", "s", "c", "d", "c", "e", "f", "e", "s"]

let occurrences = countLetterOccurrences(in: charArray)

print(occurrences) 

// Iterate over the occurrences dictionary
for (character, count) in occurrences {
    print("\(character): \(count)")
}



/*
run:
     
["c": 2, "d": 1, "e": 2, "s": 3, "f": 1, "w": 1]
c: 2
d: 1
e: 2
s: 3
f: 1
w: 1
     
*/
 

 

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