> For the complete documentation index, see [llms.txt](https://docs.flarescript.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flarescript.dev/functions.md).

# Functions

#### Function Declarations

```flarescript
function functionName(parameterList): ReturnType {
    // Function body
}
```

* `parameterList` is a comma-separated list of parameters with their types.
* `ReturnType` is optional; if omitted, the function does not return a value.

#### Parameters

Parameters are declared with their name and type.

```flarescript
function add(a: uint256, b: uint256): uint256 {
    return a + b;
}
```

#### Return Types

Specify the return type after the parameter list and a colon.

```flarescript
function isPositive(number: uint256): bool {
    // Function body
}
```

*Note: The `bool` type may not be fully implemented yet; currently, functions can return `uint256`.*

#### Return Statements

Use the `return` keyword to return a value from a function.

```flarescript
return expression;
```