> ## Documentation Index
> Fetch the complete documentation index at: https://docs.projectreal.gg/llms.txt
> Use this file to discover all available pages before exploring further.

# getfunctionhash

> Returns an uppercase SHA384 hex digest derived from a Luau function. The argument must be a function, and C closures raise "Lua function expected". If no hashable function content is available, the function returns nil.

Returns an uppercase SHA384 hex digest derived from a Luau function. The argument must be a function, and C closures raise "Lua function expected". If no hashable function content is available, the function returns nil.

## Syntax

```lua theme={null}
getfunctionhash(func: function): string | nil
```

## Arguments

| Name   | Type       | Required | Description                                                                |
| ------ | ---------- | -------- | -------------------------------------------------------------------------- |
| `func` | `function` | Yes      | Luau function to hash. Passing a C closure raises "Lua function expected". |

## Returns

| Name   | Type            | Description                                                                              |
| ------ | --------------- | ---------------------------------------------------------------------------------------- |
| `hash` | `string \| nil` | Uppercase SHA384 hex digest string, or nil if no hashable function content is available. |

## Example

Hash the Proto bytes for a Luau function closure.

```lua theme={null}
local function sample(value)
    return value + 1
end

local hash = getfunctionhash(sample)
print(hash)
```