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the `copywithin` method in javascript is an array function that allows you to copy a sequence of elements within the same array to a different location, effectively overwriting existing elements. this method takes up to three parameters: the target index where the copied elements will be placed, the start index from where the copy begins, and an optional end index that defines where the copying stops. if the end index is not specified, it defaults to the array's length. the original array is modified in place, meaning it does not create a new array but rather alters the existing one. this method is useful for scenarios where you need to rearrange elements without creating a new array, providing a concise way to manipulate data within an array. it helps in optimizing memory usage and can streamline certain operations in array management.
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