1-percentage-change.js

Author: Abayie

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;
@@ -20,3 +20,57 @@ console.log(`The percentage change is ${percentageChange}`);
 // d) Identify all the lines that are variable declarations
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+
+/* SOLUTION
+
+
+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**:
+1. `carPrice.replaceAll(",", "")`  
+2. `Number(carPrice.replaceAll(",", ""))`  
+3. `priceAfterOneYear.replaceAll("," "")` (should be `replaceAll(",", "")`)  
+4. `Number(priceAfterOneYear.replaceAll("," ""))` (should be `replaceAll(",", "")`)  
+5. `console.log(...)`
+
+**Lines with function calls:**  
+- `carPrice = Number(carPrice.replaceAll(",", ""));`  
+- `priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));`  
+- `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?**  
+The error is on this line:  
+```javascript
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+```
+There is a syntax error: `replaceAll("," "")` is missing a comma between the arguments.  
+**Fix:**  
+```javascript
+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";`
+- `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 removes all commas from the `carPrice` string (e.g., turns `"10,000"` into `"10000"`), then converts the result to a number (`10000`). 
+This allows for mathematical operations on the price.
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+*/