Javascript-Homework/tddExample.html at main · Thinkgraser/Javascript-Homework · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <script>
        // Create a function called salesDiscount that will accept the sale price and the discount rate.
        //It will return the discounted sales price.
        //assumption: discount can be a string containing %
        //assumption: return discounted sales price should be numeric, not formatted string

        function salesDiscount(inPrice,inDiscount){
            //return inPrice;
            //return parseFloat(inDiscount)/100;
            //return inPrice - (inPrice*inDiscount);

            //inDiscount is a string then parse/100 else use it

            if(typeof inPrice == 'string'){ //price must be a number
                return -1;
            }

            if(inPrice < 0){        //price must be 0 or greater
                return -1;
            }

            if( typeof inDiscount == 'string'){
                //if parseFloat returns a negative value return -1 else /100 to get a decimal
                if(parseFloat(inDiscount) < 0 || isNaN(parseFloat(inDiscount)) ){
                    return -1
                }
                else if(inDiscount.indexOf("%") != inDiscount.length - 1){
                    return -1
                }
                else if(inDiscount.match("[a-z]")){return - 1}
                else{
                    discount = parseFloat(inDiscount)/100;

                }
            }
            else{
                discount = inDiscount;
            }

            let finalPrice = inPrice - (inPrice * discount);


            return Math.round((finalPrice + Number.EPSILON) * 100) / 100;
        }

        //test cases
        console.log("parseFloat(a) " + parseFloat('a'));
        console.log("first test: " +  salesDiscount() );
        console.log("10.00 10% " +  salesDiscount(10.00,'10%') );
        console.log("10.00 .10 " +  salesDiscount(10.00,.10) );
        console.log("0 20% " +  salesDiscount(0,'20%') );
        console.log("10.00 0 " +  salesDiscount(10.00,0) );
        console.log("-1 10% " +  salesDiscount(-1,'10%') );
        console.log("a 10% " +  salesDiscount('a','10%') );
        console.log("10.00 '-10%' " +  salesDiscount(10.00,'-10%') );
        console.log("10.00 'a' " +  salesDiscount(10.00,'a') );
         console.log("8.55 5% " + salesDiscount(8.55, '5%'))
         console.log("8.55 2.5% " + salesDiscount(8.55, "2.5%"))
         console.log("8.55 .025 " + salesDiscount(8.55, .025))
         console.log("8.55 0.5% " + salesDiscount(8.55, "0.5%"))
        console.log("10.00 % " + salesDiscount(10.00, "%"))
        console.log("10.00 %5 " + salesDiscount(10.00, "%5"))
        console.log("10.00 5%3 " + salesDiscount(10.00, "5%3"))
        console.log("10.00 %53% " + salesDiscount(10.00, "%53%"))
        console.log("10.00 a% " + salesDiscount(10.00, "a%"))
        console.log("10.00 %a% " + salesDiscount(10.00, "%a%"))
        console.log("10.00 4a% " + salesDiscount(10.00, "4a%"))//error
        console.log("10.00 %4a% " + salesDiscount(10.00, "%4a%"))


    </script>
</head>
<body>

</body>
</html>