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This adds a couple of methods that are useful for locating specific elements as part of a lazy, array-like traversal. Without them you would have to use
someorreduceortoArraywhich are inefficient if you just want to locate an element and quit. This could be generalized with a (hypothetical)reduceUntilmethod, but I think the find cases are conventional enough to be expected and be worth supporting directly as is already done withsome.See:
find (MDN)
findIndex (MDN)