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in javascript, both set and array are used to store collections of values, but they serve different purposes and have distinct characteristics. an array is an ordered list of items, allowing duplicates, and supports various methods for manipulating the collection, such as push, pop, and splice. arrays maintain the order of elements and are ideal for scenarios where you need to track sequences or access elements by index.

on the other hand, a set is an unordered collection of unique values, meaning it automatically eliminates duplicates. sets are useful when you need to ensure that a value appears only once, like in cases of maintaining distinct elements or performing set operations (e.g., union, intersection).

when choosing between them, use an array for ordered lists or when duplicates are allowed, and opt for a set when uniqueness is essential and you don't care about the order of elements.
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