Difference between revisions of "Ternary Operator"
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| − | '''Supported platforms:''' [[File:Platform android.png]][[File:Platform ios.png]][[File:Platform mac.png]][[File:Platform pc.png]]<br/> | + | '''Supported platforms:''' [[File:Platform android.png]][[File:Platform ios.png]][[File:Platform mac.png]][[File:Platform pc.png]][[File:Platform linux.png]]<br/> |
'''Available since:''' Gideros 2022.5<br/> | '''Available since:''' Gideros 2022.5<br/> | ||
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Luau introduces a form of ternary conditional using if cond then value else alternative syntax. | Luau introduces a form of ternary conditional using if cond then value else alternative syntax. | ||
| − | See '''https:// | + | See '''https://luau.org/syntax#if-then-else-expressions'''. |
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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 '''''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. | ||
Latest revision as of 23:49, 13 January 2025
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://luau.org/syntax#if-then-else-expressions.
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
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,
})
-- 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
See also
https://wiki.gideros.rocks/index.php/Ftf_snippets#TERNARY_OPERATOR_.40hgy29
