Golang in sixty seconds — Count occurrences in a string

Did you ever want to quickly count how many times the letter s appears in Mississippi? Well Go has your back:

strings.Count("Mississippi", "s") // 4

One of the most common code golf challenges I've seen is to count the occurrences of a letter in a string and do something with the information. Let's change every letter the word “Mississippi” into the number of times it occurs in the word:

word := “Mississippi”
newWord := “”
for _, l := range word {
    newWord = newWord + strconv.Itoa(strings.Count(word, string(l)))
}
fmt.Println(newWord) // "14444444224"

Here we're looping over each rune (character) in the word, counting the number of times it occurs, converting that number to a string and appending it to the newWord string. You can try it out here

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