How to Convert a []byte to an int in Go?

Conversion Strategies: []byte to int in Go

Converting data from a byte slice ([]byte) to an integer (int) arises in various scenarios, as exemplified in the need to transmit numerical values over TCP. This query explores the conversion methods available in Go.

Converting []byte to int using encoding/binary

The encoding/binary package provides a convenient mechanism for converting between byte sequences and basic data types. It supports conversions for 16, 32, and 64-bit types.

The ByteOrder interface, which defines the endianness of the byte order (big- or little-endian), plays a crucial role in this conversion. The following code snippet demonstrates how to convert a []byte into an uint64 using the ByteOrder.Uint64() function, assuming big-endian byte order:

package main

import "fmt"
import "encoding/binary"

func main() {
    var mySlice = []byte{244, 244, 244, 244, 244, 244, 244, 244}  // 8-byte value represented as []byte
    data := binary.BigEndian.Uint64(mySlice)
    fmt.Println(data)  // Prints: 18446744073709551615
}

In this example, the mySlice []byte instance represents an 8-byte unsigned integer. The binary.BigEndian.Uint64() function converts this byte sequence into an uint64 using big-endian byte order (which specifies that the most significant byte appears first in the byte sequence).

Note: The conversion function depends on the desired data type. For example, binary.BigEndian.Uint16() would be used for converting to a 16-bit unsigned integer.

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