In JS, there is no negative numeric literal. `-500` might look like one, but it's actually +500 negated using the unary `-` operator.
The more you know 
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they missed the opportunity of calling it `elf`, imagine saying "Look at all these elfs in this code!"
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.
…but it’s just an `if` nested within an `else` block without braces.
else if (x) {}
→
else { if (x) {} }