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並前往https://hashnode.com/post/whats-the-best-alternative-to-indexof-for-checking-existence-of-element-in-an-array-cio2qsik800hc1p53w7u8k5vu

What's the best alternative to indexOf() for checking existence ...

I'd suggest you use binary search for searching for the element; if a valid array index is there, return true, else return false. Now, adapting ...

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