Damn JavaScript

The problem is that + becomes a concatenation operator in the pressence of a string, but minus keeps its mathematical purpose. Couple that with type coercion and you got yourself a foot gun (or a shin smasher in this case). It's easy to avoid once you know to look out for it.

parseInt()

@JonnyCodewalker The joke is that the rider is inflicting the pain upon himself, but blaming $COMMONLY_TALKED_DOWN_CONCEPT

The thing is this makes total sense tbh. You can add to a string but you can't subtract from one. Therefore - is expected to be used on a number and + can be used on anything. Since a string was supplied it assumes that you want to use it as a string.

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