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Style Guide: Keyed v-for (question)
See original GitHub issueIn instances when a good unique key does not exist for what you’re iterating over, is:
<li
v-for="(item, index) in items"
:key="index"
>
Considered good or bad practice?
Issue Analytics
- State:
- Created 6 years ago
- Comments:5 (4 by maintainers)
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This has been addressed now. 👍
Great question! I’d like to add that using the index can cause some serious performance issues. For example, let’s say the first item in the array is removed. if you use an index, Vue will assume the last element was removed and update every remaining element as it shifts everything down, thinking they’ve all changed. So you get the worst possible performance. 😢
@dannyrb Does that make sense? And do you think it would be helpful to add more information in the description for the rule?