How do I access the previous and current values in a v-for loop in Vue.js in order to compare them?

I am working on a structural component that involves looping through a list and performing certain actions based on the items:

....
<template v-for="(item, INDEX) in someList">
    <template v-if="thisIsArrayList(item)">
        <template v-for="(_item) in item">
            <Component
                :item="_item"
                :key="_item.id"
                :myprop="checkIndex(INDEX)" - where INDEX is manipulated to ensure unique values for each iteration
            ></Component>
        </template>
    </template>
    <template v-else>
        ....
    </template>
</template>
....

The value of INDEX can be repeated multiple times, such as (22, 22, 22), followed by another set like (25, 25), and so on. I have attempted to compare the previous index with the current one in order to pass a new incremented value to the child component.

For instance:

If INDEX is repeatedly equal to 22, then change it to 0 and return this value. The next set of INDEX being equal to 55 should be changed to 1 and returned. This pattern continues...

How can I achieve this logic within Vue? Are there alternative solutions available?

Thank you.

Answer №1

Using v-for in Vue.js eliminates the need for an explicit variable as it provides the ability to extract index during iteration.

<template v-for="(item, index) in items">
    <Component
        :item="item"
        :key="item.id"
    ></Component>
</template>

The arrayId prop is unnecessary in the code above since you no longer need to compare indexes and avoid redundant values.

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