In which cases is the Little-Endian byte order used in computer systems?

The Little-Endian byte order is used in systems where the least significant byte of a number is stored at the lower memory address. This is common in x86 and x86-64 processor architectures.

Use cases include:

• Internal data representation in most personal computers.
• Working with network protocols or files where byte order consistency is required.
• Serialization and deserialization of data when the byte order needs to be explicitly specified.

For example, the number 0x12345678 in Little-Endian will be stored in memory as 78 56 34 12.

In Go, you can use the encoding/binary package to work with Little-Endian:

import (
    "encoding/binary"
    "bytes"
    "fmt"
)

func main() {
    buf := new(bytes.Buffer)
    var num uint32 = 0x12345678
    binary.Write(buf, binary.LittleEndian, num)
    fmt.Printf("% x\n", buf.Bytes()) // Outputs: 78 56 34 12
}