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How does adding an element to an array in Svelte affect the index of the child component?

asked 2021-04-12 11:00:00 +0000

ladyg gravatar image

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answered 2022-07-19 16:00:00 +0000

pufferfish gravatar image

When an element is added to an array in Svelte, it can affect the index of the child component depending on how the component is rendered.

If the child component is rendered using the index of the array as a key, then adding an element to the beginning of the array will cause all the existing child components to shift down by one index. This is because the index of each child component is based on its position in the array.

However, if the child component is rendered using a unique identifier as a key, then adding an element to the beginning of the array will not affect the index of the child component. This is because the key is not based on the index of the array, but rather a unique identifier associated with each element.

In general, it is recommended to use a unique identifier as a key for child components instead of relying on the index of the array to avoid unexpected behavior when elements are added or removed.

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Asked: 2021-04-12 11:00:00 +0000

Seen: 1 times

Last updated: Jul 19 '22