Tour of Lux · chapter 6 of 8

Signals

Reactive state, one primitive.

A signal is a value that knows how to change: read it like a value, change it with .update(old -> new). In a script it's a convenient mutable cell — in the next chapter, the same primitive drives live UI.

fn main():
    let count = signal(10)
    count.update(n -> n * 2)
    count.update(n -> n + 1)
    println("count = {count}")

    let names = signal(["Ada"])
    names.update(xs -> xs + ["Grace"])
    println("names = {names}")

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