What is the oddest JavaScript behavior?

Ben Halpern - Aug 29 '19 - - Dev Community

JavaScript is notorious for its inconsistencies in a lot of areas. It's also powerful and popular and has a lot going for it.

But can we poke fun at weird things? (whether or not the behavior is a good thing in general)

Let's start with an example:

answer re: Why is the result of ('b'+'a'+ + 'a' + 'a').toLowerCase() 'banana'?
Aug 12 '19
627

+'a' resolves to NaN ("Not a Number") because it coerces a string to a number, while the character a cannot be parsed as a number 

document.write(+'a');
To lowercase it becomes nan.

Adding NaN to "ba" turns NaN into the string "NaN" due to type…

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