How to Convert a Byte Slice to a Float64 in GoLang?

Converting Byte Slice to Float64 in GoLang

In GoLang, it might be necessary to convert a byte slice, represented as []uint8, into a float64. However, finding a straightforward solution online can be challenging. Attempting to convert the byte slice to a string and then to a float64 may result in data loss and incorrect values.

To address this issue, binary operations and mathematical functions provide an efficient method for converting byte slices to float64:

package main

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

// Convert []uint8 to float64
func Float64frombytes(bytes []byte) float64 {
    bits := binary.LittleEndian.Uint64(bytes)
    float := math.Float64frombits(bits)
    return float
}

// Convert float64 to []uint8
func Float64bytes(float float64) []byte {
    bits := math.Float64bits(float)
    bytes := make([]byte, 8)
    binary.LittleEndian.PutUint64(bytes, bits)
    return bytes
}

func main() {
    // Example: Converting math.Pi to byte slice and back to float64
    bytes := Float64bytes(math.Pi)
    fmt.Println(bytes)
    float := Float64frombytes(bytes)
    fmt.Println(float)
}

Output:

[24 45 68 84 251 33 9 64]
3.141592653589793

This code snippet demonstrates how to convert a byte slice to a float64 using the binary.LittleEndian package and the math.Float64frombits function. Conversely, it also shows how to convert a float64 back to a byte slice using the math.Float64bits and binary.LittleEndian.PutUint64 functions.

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