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Transfer practice · Return "missing" only for nil, and "present" for every other value. Test false, zero and empty text.
v3 · Activity 1 of 1 · truthiness · nil · defaults · 9 min Runs here
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Return "missing" only for nil, and "present" for every other value. Test false, zero and empty text.
Interface: soundEnabled(value) -> boolean; nil input uses true.
| Input | Expected |
|---|---|
False is presentfalse | "present" |
Zero is present0 | "present" |
Empty text is present"" | "present" |
Absentnil | "missing" |
local function volumeOrDefault(volume)
if volume == nil then
return 50
end
return volume
end
return volumeOrDefaultMissing volume becomes 50, but volume 0 stays 0 because zero is not missing.
New syntax: value == nil, value or default
In a condition, only false and nil count as falsey. Zero and the empty string are truthy. Luau does not treat zero as automatically false.
value or default returns one of its operands; it is not always a boolean. This shortcut replaces both nil and false, which may be wrong for settings.
Use value == nil when absence is the specific condition you care about. Preserve false as a deliberate setting.
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soundEnabledvalue
value
soundEnabledThis is a private experiment copy. It does not replace your answer or complete the activity.
These inputs apply when your scratchpad returns the function described by the activity interface.
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