Go language skills: quickly count the frequency of characters in a string

Go language skills: Quickly count the frequency of characters in a string

In the Go language, counting the frequency of characters in a string is a common operation. By using the map data structure, we can implement this function quickly and efficiently. In this article, we will introduce how to use Go language to write code to count the frequency of characters in a string, with specific code examples.

First, we need to define a function to count the frequency of characters in a string. The code example is as follows:

package main

import (
    "fmt"
)

func countCharacterFrequency(input string) map[rune]int {
    frequency := make(map[rune]int)

    for _, char := range input {
        frequency[char]++
    }

    return frequency
}

func main() {
    input := "Hello, World!"
    
    frequency := countCharacterFrequency(input)

    for char, count := range frequency {
        fmt.Printf("Character '%c' appears %d times
", char, count)
    }
}

In the above code example, we have defined a function called countCharacterFrequency that accepts a string as input and returns a map where the key is the character and the value is the character The number of occurrences in the string. Then, in the main function, we call the countCharacterFrequency function, traverse the result map, and print out the number of occurrences of each character.

You can copy and paste the above code into a Go source file, and run the program, input a string, the program will count the frequency of each character in the string and output the results.

In this way, we can quickly and simply count the frequency of characters in a string, which is very useful for some application scenarios that need to process strings. I hope this little tip can help you make better use of the features of the Go language.

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