Does sort mutate the original array in JavaScript?
Yes. sort sorts in place and returns the same array. Use [...arr].sort() to sort a copy without mutating the original. Always pass a comparator for numbers (default is string comparison).
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More FAQs in Other Useful Array Methods in JavaScript
find returns the first matching element (or undefined) and stops early. filter returns all matching elements as an array and iterates the entire array. Use find for one match; use filter for all matches.
some returns true if at least one element passes the test (stops at the first truthy). every returns true if all elements pass the test (stops at the first falsy). Both support early exit.
flat flattens the array by a given depth (default 1). flatMap is map followed by flat(1): it maps each element to an array and flattens the result by one level. Use flatMap when you want to map and flatten in one step.
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