1-percentage-change.js

Author: enjoy15

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

@@ -12,11 +12,29 @@ 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
+// 5 function calls 
+//Line 4: carPrice.replaceAll(",", "")
+//Line 4: Number(...) – wraps the above
+//Line 5: priceAfterOneYear.replaceAll(",", "") ✅ But this line has a syntax error (we’ll get to it)
+//Line 5: Number(...) – wraps the above
+//Line 10: console.log(...)
+
 
 // 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?
+//syntax error! On line 5, there's a missing comma in the replaceAll method. 
+//correct code should be
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 // c) Identify all the lines that are variable reassignment statements
+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";
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// This expression converts a string with commas into a number that can be used for mathematical calculations:
+// 1. carPrice.replaceAll(",", "") - removes all commas from the string "10,000" → "10000"
+// 2. Number(...) - converts the cleaned string "10000" into the number 10000
+// Purpose: Strings with commas cannot be used in math operations, so we need to clean and convert them to numbers first