Front-end developers often face the challenge of creating reusable UI components, particularly when crafting elements like autocomplete functionalities. The text explores how to design such components in a way that maintains core behavior while allowing for customizable presentations, using modern JavaScript tools like render props in React and scoped slots in Vue. It demonstrates restructuring a React autocomplete component by separating the search logic from the rendering process, which enhances reusability across different visual contexts. The same concept is applied in Vue through scoped slots, enabling developers to define core behaviors that can be shared across different use cases without duplicating code. The text highlights the versatility of render props and scoped slots not only for UI components but also for data fetching and observing element dimensions, thereby promoting modular and maintainable code architecture.