CODEWITHSUNDEEP
go
toti toto
toti toto

Reputation: 87

How to convert int32 unicode to string

I have a function that receives a list of hostnames , line by line, in an int32 slice format. This is the function:

func HandlePipeList(targetsList []int32) {
    //Print output item by item
    for i := 0; i < len(targetsList); i++ {
        fmt.Printf("%c", targetsList[i])
    }
}

Since I'm converting it to %c with fmt, it works and prints the hostnames correctly. My problem arises when I try to pass targetsList as a string to another function. How can I make the same convertion for targetsList so that the lines could be passed as string? (strconv.Itoa didn't work here).

Upvotes: 0

Views: 818

Answers (2)

peterSO
peterSO

Reputation: 166885

A unicode code point in Go is a rune. Go type rune is an alias for Go type int32.

The Go Programming Language Specification

Numeric types

int32   the set of all signed 32-bit integers

rune    alias for int32

Conversions

Conversions to and from a string type

Converting a slice of runes to a string type yields a string that is the concatenation of the individual rune values converted to strings.

Use a string type conversion. For example,

package main

import (
    "fmt"
)

func main() {
    targetsList := []int32("Testing, testing, ...")

    str := string(targetsList)
    fmt.Println(str)
}

Playground: https://play.golang.org/p/d-s0uLFl9MG

Output:

Testing, testing, ...

Reference: The Go Blog: Strings, bytes, runes and characters in Go

Upvotes: 1

David Maze
David Maze

Reputation: 159865

The built-in rune type is just an alias for int32, so this is the same problem as converting a []rune to string. You might use something like strings.Builder(https://godoc.org/strings#Builder) to assemble the string:

func runesToString(l []int32) (string, error) {
    b := strings.Builder{}
    for _, n := range l {
        _, err := b.WriteRune(n)
        if err != nil {
            return "", err
        }
    }
    return b.String(), nil
}

https://play.golang.org/p/MEXzsamubp6 has a complete working example.

Upvotes: 0

Related Questions