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[Content]: misleading section about when derived-signals are called

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
45/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Stale
Tech stack
javascript
Domain
documentation

Research direction

Start with the derived-signals documentation page linked in the issue and compare the quoted explanation with the provided SolidJS reproduction. Update the wording so it accurately describes when the function runs, then verify the example and the resulting behavior in the documentation.

Written by the indexing model from the issue text.

Description

solid
📚 Subject area/topic

concepts/derived-values/derived-signals

📋 Page(s) affected (or suggested, for new content)

https://docs.solidjs.com/concepts/derived-values/derived-signals

📋 Description of content that is out-of-date or incorrect

These functions are not executed immediately, but instead are only called when the values they rely on are changed. When the underlying signal is changed, the function will be called again to produce a new value.

I'm beginning with solidjs, so maybe I got this wrong, but I think this is at least misleading.

It is not called when count() changed (click "call inc").
It is only called, if it is explicitly called (in the example click "call double") or if it is used in a reactive context (uncomment {/*<div>double: {double()}</div>*/})

🖥️ Reproduction in StackBlitz (if reporting incorrect content or code samples)
import { render } from "solid-js/web";
import { createSignal } from "solid-js";

function App() {
    const [count, setCount] = createSignal(0);

    const inc = () => setCount(count() + 1)
    const double = () => {console.log("double called"); return count() * 2}

    return (
        <div>
            <div>count: {count()}</div>
            {/*<div>double: {double()}</div>*/}
            <button onClick={() => inc()}>call inc</button>
            <button onClick={() => double()}>call double</button>
        </div>
    );
}

render(() => <App />, document.getElementById('app'));
Dominant language
MDX
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292
Forks
361
Avg merge
7h 51m
Merged PRs (30d)
1

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