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docs/tut/crash-course/4-source.md
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# Sources
Sources are special objects that store a single value. They are the core of
Vide's reactivity. They are called sources because they act as sources of data.
Sources are special objects that store a single value and are the core of
Vide's reactivity.
A source can be created using `source()`.
@ -20,8 +20,7 @@ by calling it with no arguments.
count(count() + 1) -- increment count by 1
```
Sources can be *derived* by wrapping them in functions. A wrapped source
effectively becomes a new source.
Sources can be *derived* by wrapping them in functions.
```lua
local count = source(0)
@ -35,7 +34,5 @@ count(1)
print(text()) -- "count: 1"
```
Sources on their own aren't very special, the above can be achieved with plain
variables. The real use for sources become apparent when used in combination
with *effects*. Similar to a signal and connection, a source and effect allows
you to do things like automatically updating UI when a source is updated.
While the above can be achieved with plain variables, the use for sources will
be obvious in the next part.