Difference between revisions of "Ternary Operator"
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=== Examples === | === Examples === | ||
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local x = if FFlagFoo then A else B | local x = if FFlagFoo then A else B | ||
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</source> | </source> | ||
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-- more trivial example | -- more trivial example | ||
local x1 = 10 | local x1 = 10 | ||
Revision as of 14:31, 13 July 2023
Supported platforms: 
Available since: Gideros 2022.5
Description
Luau introduces a form of ternary conditional using if cond then value else alternative syntax.
See https://github.com/Roblox/luau/blob/master/rfcs/syntax-if-expression.md.
The if-then-else expression must match if <expr> then <expr> else <expr>. The operator can also contain an arbitrary number of elseif clauses, like if <expr> then <expr> elseif <expr> then <expr> else <expr>. Unlike if statements, else is mandatory.
The result of the expression is the then-expression when condition is truthy (not nil or false) and else-expression otherwise. Only one of the two possible resulting expressions is evaluated.
Examples
<syntaxhighlight lang="lua"> local x = if FFlagFoo then A else B
MyComponent.validateProps = t.strictInterface({ layoutOrder = t.optional(t.number), newThing = if FFlagUseNewThing then t.whatever() else nil, }) </source>
<syntaxhighlight lang="lua"> -- more trivial example local x1 = 10 local x2 = 100 local x = if x1>x2 then x1 else x2 -- result x = 100
-- actual project code local checkanim checkanim = if ent.animation.anims[ent.animation.currentanim] then ent.animation.currentanim else g_ANIM_DEFAULT </source>
See also
https://wiki.gideros.rocks/index.php/Examples#TERNARY_OPERATOR_.40hgy29
