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Sorts array elements, usually alphabetically by default.
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Defines behavior tied to an object.
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Creates a new array by applying a function to each element.
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One class can extend another to reuse code.
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Calls parent class methods from a child class.
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Stores object keys without preventing garbage collection.
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Extract values from arrays or objects quickly.
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Like Set but only accepts objects as values.
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{name, age} = student gives variables directly.