Glossary coding Term Page
Render Function
Deterministic state → view transformer with no side effects.
Core Idea
A render function accepts state and returns markup or DOM mutations without mutating the state itself. By keeping it pure, you can reuse it across screens, feed it into helpers, and test it with simple inputs.
Why It Matters Here
Mathbong defines render functions as the backbone of every UI pattern. With that baseline, the series can discuss pattern catalogs, partial updates, and accessibility hooks in the same breath.