Answered 1-percentage-change.js

Author: debug2604

Sprint-2/3-mandatory-interpret/1-percentage-change.js

@@ -1,22 +1,33 @@
-let carPrice = "10,000";
-let priceAfterOneYear = "8,543";
-
-carPrice = Number(carPrice.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
-
-// 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?
-
-// c) Identify all the lines that are variable reassignment statements
-
-// 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?
+let carPrice = "10,000";
+let priceAfterOneYear = "8,543";
+
+carPrice = Number(carPrice.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
+// There are five function calls in this code in lines 4, 5, and 10
+// These function calls are Number, replaceAll, and 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 from line 5:
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+// There should be a comma to separate arguments 
+
+// c) Identify all the lines that are variable reassignment statements
+//  Variable reassingment statatments on lines 4 and 5.
+//  Variables carPrice and priceAfterOnYear are originally declared on lines 1 and 2, and reassigned on lines 4 and 5.
+
+// d) Identify all the lines that are variable declarations
+// They are lines 1,2,7 and 8.
+// On lines 1 and 2, variables carPrice and priceAfterOneYear are declared by let.
+// On lines 7 and 8, variables priceDifference and percentageChange are declared by const.
+
+// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// To remove comma as a punctuation and space such that the  string is ready turn into a number by method Number.