done percetage-change.js

Author: Grajales-K

Sprint-1/interpret/percentage-change.js

@@ -2,21 +2,55 @@ 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}`);
 
-// 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
+/*
+    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
+
+        --------  Number(carPrice.replaceAll(",", "")); this convert string in numbers
+        --------  replaceAll(",", "") this line is removing the "," and returning just the numbers
+        --------  console.log(`The percentage change is ${percentageChange}`); this is a function to print what we call inside.
+
+
+
+    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?
+
+        -------  In the line 5 we were missing the "," dividing the ("," "") this gave an error.
+
+
+    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?
 
-// 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 expression Number(carPrice.replaceAll(",", "")) performs two actions:
+            *  carPrice.replaceAll(",", ""):
+                The replaceAll() method is used on the string carPrice. It removes all commas "," from the 
+                string by replacing them with an empty string "".
 
-// c) Identify all the lines that are variable reassignment statements
+            *  Number(...);
+                this function is then called on the result of replaceAll(),
+                converting the string now without commas into a numeric value eg 10,000 => 10000
 
-// 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?
+*/