# readFloat64

`import { readFloat64 } from "destack:bytes";`

Read one 64-bit float.

```ds title="readFloat64"
export function readFloat64(bytes: &'a readonly [uint8], offset: usize, order?: "bigEndian" | "littleEndian"): float64
```

[language/library/src/bytes/bytes.ds:74:80](https://github.com/destack-sh/destack/blob/main/language/library/src/bytes/bytes.ds#L74-L80)