How to Convert a Hexadecimal String to a Byte Array in Go?

Transferring Hex Strings to Byte Arrays in Go

Converting hexadecimal strings directly into byte arrays in Go is straightforward with the hex.DecodeString() function.

Question: How do we convert the hexadecimal string "46447381" into the byte array {0x46,0x44,0x73,0x81}?

Answer:

package main

import (
    "encoding/hex"
    "fmt"
)

func main() {
    s := "46447381"

    // Decode the hexadecimal string into a byte array
    data, err := hex.DecodeString(s)
    if err != nil {
        panic(err)
    }

    // Print the byte array in hexadecimal format
    fmt.Printf("% x", data)
}

Output:

46 44 73 81

Note: When printing the byte array directly using fmt.Println(data), the output will be in decimal format:

[70 68 115 129]

However, these numbers represent the same hexadecimal values in a different base.

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