Data-driven lists and class merging

Render repeated UI from data rather than duplicating markup. Use stable keys in React lists and keep each item's semantics clear. If a component accepts caller-provided classes, understand how conflicts are resolved: blindly appending p-8 after p-4 does not guarantee the expected result because generated CSS order is not simply the order of tokens in the HTML string.

A class-merging helper can resolve known Tailwind utility conflicts, but it is an additional dependency and must be compatible with your Tailwind version. It should not be used as a substitute for a coherent component API.

Data-driven cards

const metrics = [
  { label: "Open tasks", value: 18, tone: "text-blue-700" },
  { label: "Completed", value: 42, tone: "text-emerald-700" },
  { label: "Overdue", value: 3, tone: "text-red-700" },
];

function MetricGrid() {
  return (
    <section className="grid grid-cols-1 gap-4 sm:grid-cols-3">
      {metrics.map((metric) => (
        <article key={metric.label} className="rounded-xl border border-slate-200 bg-white p-5">
          <p className="text-sm text-slate-600">{metric.label}</p>
          <p className={`mt-2 text-3xl font-bold ${metric.tone}`}>{metric.value}</p>
        </article>
      ))}
    </section>
  );
}

💡 The array keeps content separate from presentation structure. Each item uses a stable key. The tone strings are complete utilities, and the grid responds to available width.

Key Takeaways

Keep class candidates complete in source.
Use stable keys for data-driven React lists.
Define clear component APIs instead of relying on arbitrary class overrides.

Data-driven lists and class merging

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