Javascript Operations that return NaN

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Mathematical operations on values other than numbers return NaN.

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"b" * 3
"cde" - "e"
[1, 2, 3] * 2

An exception: Single-number arrays.

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[2] * [3] // Returns 6

Also, remember that the + operator concatenates strings.

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"a" + "b" // Returns "ab"

Dividing zero by zero returns NaN.

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0 / 0 // NaN

Note: In mathematics generally (unlike in JavaScript programming), dividing by zero is not possible.