Golang byte type and variable

[mtchuyen]

1. Byte type

(1). A byte in Go is an unsigned 8-bit integer. It has type uint8.

(2). A byte has a limit of 0 – 255 in numerical range.

(3). It can represent an ASCII character.

2. Sampe code:

package main

import (
    "fmt"
)

const N = 512 * 1024 * 1024 // 500M
const M = 123

var v byte = 12

func main() {
    fmt.Println("Hello, playground")

    var s = []byte{N: 0}
    for i := range s {
        s[i] = v + byte(i)
        println(i, s[i])
    }
}

Note:

• v is byte type: In define (1.2), the initial value of v must less 255. (var v byte = 12)
• s[i] always less then 255 in for loop s[i] = v + byte(i).
• const N make stack overflow, see link

3. Ref

• 3.1: https://zetcode.com/golang/byte/
• 3.2: https://medium.com/@tyler_brewer2/bits-bytes-and-byte-slices-in-go-8a99012dcc8f
• 3.3: https://www.bogotobogo.com/GoLang/GoLang_byte_and_rune.php
• 3.4: https://golangdocs.com/golang-bytes-variable-package

[mtchuyen]

variable

The best position of variable declarations:

• Readability is key here. So it makes sense to declare a statement close to where it is first used, and limit it to the smallest possible scope where it is needed.
• the location of the variable declaration makes no difference at run time.