Evaluate Reverse Polish Notation

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Implement `evalRPN(tokens)` that evaluates an expression in **Reverse Polish Notation**. Tokens are strings: either numbers or one of `+`, `-`, `*`, `/`. Division truncates toward zero. Example: `evalRPN(["2","1","+","3","*"])` → `9`.

Hints

Push operands onto the stack.
When you see an operator, pop two values, apply the operator, and push the result.

Learning resources

MDN: Array.prototype.push / pop

Run your code to see results.