javascript - knockout.js using $index with if binding

Question

I'm trying to show some mark up based on the value of $index, I can display the value but I can't seem to use it with an if binding, what's the best approach here?

<!-- ko if: $index===0 -->
  <div>some mark up here</div>
<!-- /ko -->

Answer 1

$index is an observable, and observables are functions. When you use observables in an expression you must use the () form to access the value.

<!-- ko if: $index() === 0 -->