Difference between revisions of "Ternary Operator"
From GiderosMobile
(Created page with "__NOTOC__ '''Supported platforms:''' File:Platform android.pngFile:Platform ios.pngFile:Platform mac.pngFile:Platform pc.png<br/> '''Available since:''' Gidero...") |
|||
| Line 4: | Line 4: | ||
=== Description === | === Description === | ||
| − | Luau introduces a form of ternary conditional using if cond then value else alternative syntax '''https://github.com/Roblox/luau/blob/master/rfcs/syntax-if-expression.md'''. | + | 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 '''''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. | ||
Revision as of 00:07, 30 November 2022
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
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/Examples#TERNARY_OPERATOR_.40hgy29
