If statement and toBoolean

JavaScript
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Why [1][1] is undefined and will be evaluated false, it is an array so it should be true?

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What do you get if the expression evaluated is changed to [1][0]?

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[1] is an array that contains only one value at index 0. Asking [1] for index 1, which is what happens when doing [1][1] results in undefined, because the array has no index 1 location.

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