Uncaught SyntaxError: Invalid or unexpected token

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I’m using eval on a simple arithmetic string as part of the calculator project. The trouble is, whenever I use subtraction, I get an Uncaught SyntaxError: Invalid or unexpected token error. What’s driving me crazy is if I take the string that was being evaluated (output using console.log) and pass it to eval in a REPL, it works fine.

Does anybody have any idea what’s causing this? Here’s a link to the CodePen.

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change the char in your html to from − to -

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Thanks! How did you manage to track it down? It was driving me crazy.