Golang : Randomize letters from a string example
For this short tutorial, we will learn how to randomize the letters(including symbols and empty spaces) in a string. Such as:
"Hello World!"
to
" ! WoHllderlo"
Basically, the idea is to convert the string into a slice, randomize(shuffle) the elements inside the slice and then convert the slice back into a string.
Here you go!
package main
import (
"fmt"
"math/rand"
"strings"
"text/scanner"
"time"
)
func breakToCharSlice(str string) []string {
tokens := []rune(str)
var result []string
for _, char := range tokens {
result = append(result, scanner.TokenString(char))
}
return result
}
func shuffle(src []string) []string {
final := make([]string, len(src))
rand.Seed(time.Now().UTC().UnixNano())
perm := rand.Perm(len(src))
for i, v := range perm {
final[v] = src[i]
}
return final
}
func main() {
str := "Hello World!"
//strSlice := strings.Fields(str)
// we want to break the string into individual characters slice
// https://www.socketloop.com/tutorials/golang-break-string-into-a-slice-of-characters-example
strSlice := breakToCharSlice(str)
fmt.Println("Original :", str)
//fmt.Println("Converted to slice :", strSlice)
randomized := shuffle(strSlice)
// convert the slice back to string
randomizedStr := strings.Join(randomized, "")
// get rid the extra ""
randomizedStr = strings.Replace(randomizedStr, "\"", "", -1)
fmt.Printf("Randomized : %s\n", randomizedStr)
}
Some sample outputs:
>$ go run randomizeletters.go
>Original : Hello World!
>Randomized : Hlledr! lWoo
>$ go run randomizeletters.go
>Original : Hello World!
>Randomized : rdlollH oe!W
Reference:
https://www.socketloop.com/tutorials/golang-break-string-into-a-slice-of-characters-example
See also : Golang : Break string into a slice of characters example
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+14.2k Golang : Intercept Ctrl-C interrupt or kill signal and determine the signal type
+6.3k Golang : Getting Echo framework StartAutoTLS to work
+9.1k Golang : Get login name from environment and prompt for password
+12.6k Golang : How to determine if a year is leap year?
+12.6k Javascript : Prompt confirmation before exit
+15.6k Golang : Capture stdout of a child process and act according to the result
+9.1k Golang : Convert file content to Hex
+6.8k Javascript : How to check a browser's Do Not Track status?
+11.6k Golang : Drop cookie to visitor's browser and http.SetCookie() example
+19.9k Golang : Encrypt and decrypt data with TripleDES
+20.5k Golang : Match strings by wildcard patterns with filepath.Match() function
+33.8k Golang : Save image to PNG, JPEG or GIF format.