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JavaScript Interview Questions

Q   |   QA

Return true if the argument is not a number.

It’s a number in JavaScript, derived by dividing negative number by zero.

&&, || and !

Since 1 is a string, everything is a string, so the result is 124.

Since 2 and 5 are integers, this is number arithmetic, since 8 is a string, it’s concatenation, so 78 is the result.

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