# writeFloat64

`import { writeFloat64 } from "destack:bytes";`

Write one 64-bit float.

```ds title="writeFloat64"
export function writeFloat64(bytes: &'a exclusive [uint8], offset: usize, value: float64, order?: "bigEndian" | "littleEndian"): void
```

[language/library/src/bytes/bytes.ds:153:160](https://github.com/destack-sh/destack/blob/main/language/library/src/bytes/bytes.ds#L153-L160)