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> This is discussed in the article. The standard is to use infinity, not zero.

It's wrong.

How is infinity returned as a result anyway? It's not a number, and it's not <the largest number the computer can return> either.

Infinities have representation in many computer number systems, such as IEE-754 floating point, which is the number system used by Javascript.

Lots of programming languages use this standard. It's helpful to know.

No idea but in javascript Infinity is a type of constant i guess, any subsequent operations on Infinity just returns infinity instead of crashing