Challenge 1 — Solution

Task: Write a function parsePositiveNumber(value) that throws a
plain Error if value is negative or not a number (use isNaN),
otherwise returns it. Call it inside a try/catch with a value that
triggers the error, logging the caught message.

function parsePositiveNumber(value) {
    if (isNaN(value)) {
        throw new Error("Value is not a number");
    }
    if (value < 0) {
        throw new Error("Value cannot be negative");
    }
    return value;
}

try {
    const result = parsePositiveNumber(-5);
    console.log(result);
} catch (error) {
    console.log("Error:", error.message);
}


Expected output:

Error: Value cannot be negative


Notes:
- isNaN(value) is checked first since "not a number" and "negative"
  are different problems, each deserving its own clear message
  rather than one generic error for both.
- console.log(result) never runs because parsePositiveNumber throws
  before ever reaching its return statement — execution jumps
  straight into the catch block instead.
- Calling parsePositiveNumber("abc") instead would trigger the
  isNaN check and log "Value is not a number".