> The one exception to that is JavaScript, where NaNs pop up significantly more than in most other languages - parseInt() will return a NaN if you give it an in

> The one exception to that is JavaScript, where NaNs pop up significantly more than in most other languages - parseInt() will return a NaN if you give it an invalid number, most other languages a function called “parseInt” wouldn’t return floating point. Ahh, every time this conversation about how SQL Nulls violate reflexive property of equality, people are like "so do NaNs" and I'm wondering "who are these people who are dealing with NaNs all the time?". I'm mostly a back-end and DevOps guy, so I don't write that much JS. I didn't know that JS used NaN the way other languages would use Null or exceptions for numerical operations. ... Also that's terrible.