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What is the correct way to add a css class decided by a condition in Vue:
<div class={{current == key ? ' is-active' : '' }}> Page title</div>
<div :class="{'is-active': current === key }">
You just use an object where each class you desire is the key, and the value is the comparator.
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This is the most convenient way to me, you can add multiple classes using conditions
<div :class="[current === key ? 'is-active' : '', otherClassCondition ? 'other-class' : '']">
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