'Is the :key attribute mandatory in v-for loops?

i don't have a real problem, just i read somewhere once that a :key attribute in vue 3 is not mandatory in a v-for loop. Is this correct and if so, when do I need a key in v-for loops and when not? Or do I not need it at all ? What is it needed for if it is necessary?

Thanks a lot.

vue.jsvuejs3v-for


Solution 1:[1]

It's better for you to use it in all v-for loops.

The key special attribute is used as a hint for Vue's virtual DOM algorithm to keep track of a node's identity. That way, Vue knows when it can reuse and patch existing nodes and when it needs to reorder or recreate them.

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Solution 1 fdisotto

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