> ## 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.

# isvalidlevel

> Checks whether a numeric stack level is within the current call stack range. level is required and must be a number because the function calls requires a number. The value is converted to an integer. The function returns false when level < 0 or level >= the current call stack depth, otherwise true. It does not inspect the frame closure and does not raise "Level out of range" for invalid numeric levels. validlevel is a global alias, and debug.isvalidlevel plus debug.validlevel are exposed with the debug table aliases.

Checks whether a numeric stack level is within the current call stack range. level is required and must be a number because the function calls requires a number. The value is converted to an integer. The function returns false when level \< 0 or level >= the current call stack depth, otherwise true. It does not inspect the frame closure and does not raise "Level out of range" for invalid numeric levels. validlevel is a global alias, and debug.isvalidlevel plus debug.validlevel are exposed with the debug table aliases.

## Syntax

```lua theme={null}
isvalidlevel(level: number): boolean
```

## Aliases

* `validlevel`
* `debug.isvalidlevel`
* `debug.validlevel`

## Arguments

| Name    | Type     | Required | Description                                                                                                 |
| ------- | -------- | -------- | ----------------------------------------------------------------------------------------------------------- |
| `level` | `number` | Yes      | Stack level number converted to an integer and checked against 0 \<= level \< the current call stack depth. |

## Returns

| Name    | Type      | Description                                                                          |
| ------- | --------- | ------------------------------------------------------------------------------------ |
| `valid` | `boolean` | true when the numeric level is within the current call stack range, otherwise false. |

## Example

Check whether a numeric stack level is inside the current call stack range.

```lua theme={null}
print(isvalidlevel(0))
print(validlevel(0))
print(debug.isvalidlevel(0))
print(debug.validlevel(0))
```