Eugen Posts - Answer Overflow

Eugen

•Created by Eugen on 4/29/2024 in #support

Does the createMemo() in the "Solid in 100 secs" vid make sense?

Hi - I just stumbled upon Solid, and the two introductory vids really made me curious, coming from React. I just wonder if the createMemo() usage in the video makes sense, assuming computation was really heavy. Because I would think that squared only gets recomputed when its dependencies - count in this case - change. Here's the code:

function Counter() {
    const [count, setCount] = createSignal (10);
    const squared = createMemo (() => count () ** 2);
    return <p>{ squared() }</p>
}

function Counter() {
    const [count, setCount] = createSignal (10);
    const squared = createMemo (() => count () ** 2);
    return <p>{ squared() }</p>
}

I can see though that it makes sense if there is an A - B - A change of count. In that case, the computation would not need to be redone in the case of the second A, when using createMemo.

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