completed 1-percentage-change.js with comments

Author: AngelaMcLeary

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

@@ -1,22 +1,47 @@
 let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
-carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+carPrice = Number(carPrice.replaceAll(",", "")); // returns 10000
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",",""));//returns 8543
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," "")); 
+// incorrect code missing syntax ie a comma
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
 
-console.log(`The percentage change is ${percentageChange}`);
+console.log(`The percentage change is ${percentageChange}`); //returns The percentage change is 14.57
 
 // 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
+// a) How many function calls are there in this file? 
+// Write down all the lines where a function call is made
+//*Answer
+//There are 5 function calls: 2* Number(), 2*.replaceAll() and 1* console.log().
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",",""));
+//console.log(`The percentage change is ${percentageChange}`);
 
-// 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?
+// 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?
+//*Answer it is missing a comma on line 5.
+// Add the comma to fix it: ...replaceAll(",",""));
 
 // c) Identify all the lines that are variable reassignment statements
+//*Answer
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+
 
 // 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;
+
+
+// e) Describe what the expression 
+// Number(carPrice.replaceAll(",","")) is doing - 
+// what is the purpose of this expression?
+//It converts the carPrice into a number and removes the spaces and commas.
+
 
-// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?