The answer
Write a HOF that takes a configuration (like a minimum length) and returns a validator function. Example: function minLength(n) { return (value) => value.length >= n; }. Then use validators.every(fn => fn(input)) to check all.
Real-World Higher-Order Functions in JavaScript
How do you create configurable validators with HOFs in JavaScript?
More FAQs in Real-World Higher-Order Functions in JavaScript
Event handlers, middleware (Express, Redux), React higher-order components, debounced search, memoized API calls, configurable validators, and array pipelines. HOFs are everywhere in modern JavaScript.
Middleware is a function that takes a store and returns a function that takes next and returns a function that takes action. Each layer is a HOF that adds behavior. Express and Redux middleware work this way.
A function that takes a component and returns a new component with added behavior. It is a higher-order function for components. Example: withAuth(Component) returns a component that redirects to login if not authenticated.
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