Update site/content/tutorial/02-reactivity/04-updating-arrays-and-objects/text.md

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>
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Tan Li Hau 4 years ago committed by GitHub
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@ -4,7 +4,7 @@ title: Updating arrays and objects
Svelte's reactivity is triggered by assignments. Methods that mutate arrays/objects internally will not trigger updates by themselves. Svelte's reactivity is triggered by assignments. Methods that mutate arrays/objects internally will not trigger updates by themselves.
In this example, clicking the "Add a number" button calls the `addNumber` function, which appends a number to the array but doesn't trigger the recalculation of `sum` and does not update the rendered page. In this example, clicking the "Add a number" button calls the `addNumber` function, which appends a number to the array but doesn't trigger the recalculation of `sum`.
One way to fix that is to assign `numbers` to itself to tell the compiler it has changed: One way to fix that is to assign `numbers` to itself to tell the compiler it has changed:

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