There is a variable that contains an array of arrays of objects in the following format:
let FooVar: Array<Array<FooObject>> = [] ;
The task is to iterate through this variable inside a component using the following structure:
<span v-for="item in FooVar" :key="XXX">
What should be placed inside the key attribute?
As mentioned in the official documentation
The key special attribute is primarily used to help Vue's virtual DOM algorithm identify vnodes when comparing the new and old lists of nodes.
It is also important for:
The key requirement is that keys must be unique and not have any duplicates.
Children of the same parent must have unique keys to avoid render errors.
It is recommended to add a unique identifier to each item, such as an id from the database.
<span v-for="item in FooVar" :key="item.id">
If you do not have an id, you can use the index of the item in the list.
Keep in mind that using the index as the key is NOT optimized, learn more here
<span v-for="(item, index) in FooVar" :key="index">
If you want to display an index:
<span v-for="(element, index) in myArray" :key="index">
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