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• Error Handling Intro

• This tool is being introduced just to get you thinking about it. We will cover it in more detail later

• try {
• if(!ans || isNum(ans) || ans<0) {
• throw new Error(" Invalid Number");
• }
• alert("The square of " + ans + "is " + Math.sqrt(ans));
• }
• catch (errMsg) {
• alert(errMsg.message);
• }

• This allows you to try something and if it does not work, report why instead of having your program crash