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並前往https://www.quora.com/How-do-you-check-if-a-key-exists-in-an-array-in-JavaScript

How do you check if a key exists in an array in JavaScript?

If you try the above code it'll return true for 0 as 0 is key for 10. but it'll return false for 2 as there are only two keys in the array. 0 and 1.

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