debug.getconstant

C closures are not supported

This function will throw an error if called on a C closure, such as print, since C closures have no accessible constants.

debug.getconstant returns the constant at the specified index from a Luau function. If no constant exists at that index, it returns nil instead.

This is useful when you want to inspect specific constant values (such as strings, numbers, or booleans) without dumping the entire list.

function debug.getconstant(func: (...any) -> (...any) | number, index: number): number | string | boolean | nil

Parameters

Parameter	Description
func	The Lua function (or stack level) whose constant to retrieve.
index	The position of the desired constant.

---

Examples

Example 1

local function dummy_function()
    local dummy_string = "foo bar"
    string.split(dummy_string, " ")
end

local result = debug.getconstant(dummy_function, 2)
print(result) -- Output: string

Example 2

local function dummy_function()
    local dummy_string = "foo bar"
    string.split(dummy_string, " ")
end

local result = debug.getconstant(dummy_function, 3)
print(result) -- Output: nil

Example 3

print(debug.getconstant(print, 1)) -- Should error due to being a C closure