What are the use cases for once, memoize, debounce, and throttle in JavaScript?
once: initialization that should only happen once. memoize: caching expensive pure functions. debounce: search inputs, auto-save, window resize. throttle: scroll, mousemove, and other rapidly-firing events.
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More FAQs in Implementing once, memoize, and debounce With Closures in JavaScript
Close over a done flag and a result variable. The first call sets done to true, calls the original function, and stores the result. Subsequent calls return the stored result without calling the function again.
Close over a cache object. Serialize the arguments as a key. If the key is in the cache, return the cached result. Otherwise, call the original function, store the result in the cache, and return it. The cache is private to the closure.
Close over a timer variable. Each call clears the previous timer and sets a new one with setTimeout. The function only runs after the user stops calling for the specified delay. The timer persists across calls via the closure.
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