add class if variable exists vue js

Ok We can pass variable as class if variable exists in loop, Here is the code

<li :class="`page-item page-item-${page ? page : ''}`"  v-for="(page,index) in totalPages" :key="index"
v-on:click.prevent="getPostsPagination(page)"
>
    <a class="page-link">
        {page}
    </a>
</li>

Notice

:class="`page-item page-item-${page ? page : ''}`"

Here we are setting "page-item-{VARIABLE}" as class

Which outputs as

So we have classes "page-item-1", "page-item-2" & "page-item-3" from loop