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Tip Calculator/calculator.js

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+const tip10per = '10';
+const tip15per = '15';
+const tip20per = '20';
+
+// Function to create the original tip percent. 
+function tipCalculator(billTotal, selectedPer) {
+    if (selectedPer === tip10per) {
+        return billTotal * .10;
+    }
+    else if (selectedPer === tip15per) {
+        return billTotal * .15;
+    }
+    else if (selectedPer === tip20per) {
+        return billTotal * .20;
+    }
+    throw new Error('tip not selected')
+}
+
+
+function totalAmount(billTotal, selectedPer, numPpl) {
+    //Gets the selected percent that you want to leave for a tip from the bill total enterd and adds them together.
+    let tipAmount = tipCalculator(billTotal, selectedPer);
+    let totalAmount = tipAmount + billTotal;
+    //Does the OCD calculations by rounding the total bill amount up to make a whole number. Then taking that number and subtracting it from the total bill, which gives you a new tip amount that makes the bill total to be a whole number.
+    let ocdTotalAmount = Math.ceil(totalAmount);
+    let ocdTipAmount = ocdTotalAmount - totalAmount;
+    let newTip = new Number(ocdTipAmount + tipAmount);
+    
+    let billInfo = {
+        prevBillTotal: billTotal,
+        tipAmount: newTip,
+        newAmount: ocdTotalAmount
+    }
+    //Sends the above content to the splitBill function if more than one person was selected.
+    if (numPpl > 1) {
+        return splitBill(billInfo, numPpl);
+    }
+    else {
+        return billInfo;
+    }
+}
+
+function splitBill(splitTotal, numPpl) {
+    //Dividing the tip and bill between selected number of people.
+    let billPerPerson = splitTotal.prevBillTotal / numPpl;
+    let tipPerPerson = splitTotal.tipAmount / numPpl;
+    //Rounding bill to nearest 100 to make sure we get back a number that can be made from change. 
+    tipPerPerson = Math.round(100 * tipPerPerson) / 100;
+
+    return {
+
+        prevBillTotal: splitTotal.prevBillTotal,
+        newAmount: billPerPerson,
+        tipAmount: tipPerPerson,
+    }
+}
+
+//Get the bill that is entered.
+function getTotalbill() {
+    return parseInt(document.getElementById('totalBillInput').value);
+}
+//Get the number of people entered.
+function getNumPpl() {
+    return parseInt(document.getElementById('numPplInput').value);
+}
+// Get the tip perect that was selected. 
+function handlePercentClick(tipPercent) {
+    let billTotal = getTotalbill();
+    let numPpl = getNumPpl();
+
+    if (billTotal <= 0) {
+        return alert('Fill in all boxes please!')
+    }
+    else {
+        //Displays to the UI
+        let finBillTotal = totalAmount(billTotal, tipPercent, numPpl);
+        document.getElementById('ocdBill').textContent = finBillTotal.newAmount;
+        document.getElementById("ocdtTipAmount").textContent = finBillTotal.tipAmount;
+    }
+}
+