description: Imported skill rendering_conditional_render from vercel name: rendering_conditional_render signature: 2ec2fa23c4148285144687050c52369adba3da2fbe3d486f8d3e0aad8f06f2bc source: /a0/tmp/skills_research/vercel/skills/react-best-practices/rules/rendering-conditional-render.md

title: Use Explicit Conditional Rendering impact: LOW impactDescription: prevents rendering 0 or NaN tags: rendering, conditional, jsx, falsy-values

Use Explicit Conditional Rendering

Use explicit ternary operators (? :) instead of && for conditional rendering when the condition can be 0, NaN, or other falsy values that render.

Incorrect (renders "0" when count is 0):

tsx

function Badge({ count }: { count: number }) {
  return (
    <div>
      {count && <span className="badge">{count}</span>}
    </div>
  )
}

// When count = 0, renders: <div>0</div>
// When count = 5, renders: <div><span class="badge">5</span></div>

Correct (renders nothing when count is 0):

tsx

function Badge({ count }: { count: number }) {
  return (
    <div>
      {count > 0 ? <span className="badge">{count}</span> : null}
    </div>
  )
}

// When count = 0, renders: <div></div>
// When count = 5, renders: <div><span class="badge">5</span></div>