All questions answered and code corrected

Author: zilinskyte

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

@@ -2,7 +2,7 @@ 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;
@@ -12,11 +12,26 @@ 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 5 function calls in this file: lines 3, 4 and 7
+// Line 4: carPrice,replaceAll(",", "") removes all commas from string
+// Line 4: Number(...) converts string into number
+// Line 5: priceAfterOneYear.replaceAll("," "") removes all commas from string
+// Line 5: Number(...) converts string to number
+// Line 10: console.log(`The percentage change is ${percentageChange}`) prints percentage change to output
 
 // 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?
+// Line 5 is missing a comma in the replaceAll function call. This is causing a syntax error because the function expects two arguments, but only one is provided. 
 
 // c) Identify all the lines that are variable reassignment statements
+// Variable reassignment means giving an existing variable a new value.
+// Lines 4 and 5 reassign new values to carPrice and priceAfterOneYear respectively.
 
 // d) Identify all the lines that are variable declarations
+// Variable declaration means creating a new variable and assigning it a value for the first time.
+// Line 1 declares carPrice with let
+// Line 2 declares priceAfterOneYear with let
+// Line 7 declares priceDifference with const
+// Line 8 declares percentageChange with const
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// It converts the string value of carPrice into a number value and removes the comma.