Example of mutating a collection about sycamore HOT 3 CLOSED

I think your case is more complex, this was about modifying a simple list of values, rather than nesting (maybe?). But it is related... I wanted to store heavier objects too and I think in my original use case I wanted to nest things.

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Now that #626 has been merged, updating a Vec or other container inside a Signal is extremely simple. Simply use .update(|value| ...) where value is a mutable reference to the value inside the Signal. I think this can be closed now since the examples (in particular, todomvc and js-framework-benchmark) have both been updated to use this instead of cloning and pushing.

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@andrewbaxter Hey is my discussion post related to what you're talking about? #615

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