percentage exercise is completed

Author: HadiVahidi20

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,7 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twelveHourClockTime = "08:53";
+const twentyFourHourClockTime = "20:53";
+
+//tha variable names are cannot start with a number
+// so the variable name 12HourClockTime is not valid because it starts with a number
+// to fix this error we can change the variable name to twelveHourClockTime and as is not relevant to the time format
+// so we can swap the variable names.

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -2,21 +2,63 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",",""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
 
-console.log(`The percentage change is ${percentageChange}`);
+console.log(`The percentage change is ${percentageChange} %`);
 
 // Read the code and then answer the questions below
 
+
+
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
 
+/*There are four function calls in total: two in the line
+
+carPrice = Number(carPrice.replaceAll(",", ""));
+
+and two in the line
+
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+
+In each line, one function is nested inside the other, so both lines contain two function calls each.*/
+
+
+
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
 
+
+/*priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+                                                        ^^^
+
+SyntaxError: missing ) after argument list
+the error is because a missing comma in the replaceAll method argument list
+*/
+
+
 // c) Identify all the lines that are variable reassignment statements
 
+
+
+/*carPrice = Number(carPrice.replaceAll(",", ""));
+ priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+ these two lines are variable reassignment statements because we are reassigning a new value to the existing variables carPrice and priceAfterOneYear.*/
+
 // d) Identify all the lines that are variable declarations
 
+
+/*let carPrice = "10,000"; 
+let priceAfterOneYear = "8,543"; 
+const priceDifference = carPrice - priceAfterOneYear; 
+const percentageChange = (priceDifference / carPrice) * 100;
+
+these four lines are variable declaration statements because we are declaring new variables:
+carPrice, priceAfterOneYear, priceDifference and percentageChange using let and const keywords.*/
+
+
+
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+/*first removes all commas from the string carPrice using replaceAll(",", ""), and then converts the resulting string into a number using Number().*/