error types in JavaScript

What this snippet does

Different error types help you identify what went wrong — TypeError for type issues, ReferenceError for missing variables, etc.

Expected output

true TypeError
true ReferenceError
true SyntaxError
true URIError

Why practise typing this

Typing error handling code builds muscle memory for the symbols and indentation JavaScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.

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