How to Convert a Byte Slice '[]uint8' to Float64 in GoLang Without Losing Value?

Converting Byte Slice "[]uint8" to Float64 in GoLang

In GoLang, converting a []uint8 byte slice to a float64 is a straightforward task. This article explores the techniques for this conversion, addressing the issue where converting to a string and then to a float64 results in value loss.

The underlying issue with the suggested solution is that the string conversion alters the byte slice's underlying data. To address this, we leverage the encoding/binary package, which provides methods for endian-safe encoding and decoding of binary data.

The Float64frombytes() function converts a byte slice to a float64 by interpreting the bytes as a little-endian-encoded 64-bit IEEE 754 floating point number. To achieve this, it uses the binary.LittleEndian.Uint64() function to convert the bytes to an unsigned 64-bit integer. Then, math.Float64frombits() is employed to convert the integer to a float64.

Conversely, the Float64bytes() function converts a float64 to a byte slice by performing the reverse operations. It retrieves the 64-bit representation of the float64 using math.Float64bits() and converts this integer to a byte slice using binary.LittleEndian.PutUint64().

The provided GoLang example demonstrates the usage of these functions to convert a float64 representing Pi to and from a byte slice. The output showcases the conversion process effectively, confirming that the original value is maintained throughout the conversions.

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