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aaron 2024-06-20 18:40:01 +01:00
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14
docs/tut/crash-course/9-derived-source.md
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@ -36,14 +36,13 @@ source(1) -- prints "ran" x2
```
To avoid this, you can use `derive()` to derive a new source instead. This will
run a function in a new reactive scope only when a dependent source has updated.
Reading this derived source multiple times will just return a cached result from
when it last updated.
run a function in a reactive scope only when a source used inside updated.
Reading this derived source multiple times will just return a cached result.
```lua
local source = vide.source
local derive = vide.derive
local effect = vide.effect
local derive = vide.derive
local count = source(0)
@ -87,6 +86,7 @@ end
```
Deriving a source in this manner is similar to creating an effect to update
another source. You should never manually do this using an effect however,
improper usage could accidently create infinite loops in the reactive graph.
Always favour deriving when you need one source to update based on another.
another source. You should never manually do this using an effect however.
Improper usage could accidently create infinite loops in the reactive graph.
Always favour deriving when you need one source to update based on another
source.