completed 3-mandatory-interpret-exercises

Author: Vaidah-dev

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

@@ -12,11 +12,16 @@ 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
-
+//answer: we have 5 function calls across 3 lines: 
+//line 4
+//line 5
+//line 10
 // 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?
-
+//answer: on line 5, there is a typo, a replaceAll("," ""));
+//fix line 5 by changing it to priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 // c) Identify all the lines that are variable reassignment statements
-
+//answer: lines 4 and 5
 // d) Identify all the lines that are variable declarations
-
+//answer: line 1, 2, 7 and 8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//answer: .ReplaceAll(",", "") this will remove a comma from the price string and number will convert that clean string into a numeric value so mathematical calculations can be perfomed.

Sprint-2/3-mandatory-interpret/2-time-format.js

@@ -12,14 +12,15 @@ console.log(result);
 // For the piece of code above, read the code and then answer the following questions
 
 // a) How many variable declarations are there in this program?
-
+//answer: we have 6 variable declarations
 // b) How many function calls are there?
-
+//answer: there is 1 function call: line 10
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
-
+//answer:% is a remainder operator, it calculates left over seconds when movie length is divided into full minutes
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+//answer:it subtracts the left over seconds from the total movie length to get a multiple of 60, then divides by 60 to convert that duration into whole minutes.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+//answer: formatted movieLength, it represents the movieLength format as a time string
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//answer: yes it can work but only for positive numbers representing total seconds, if the movieLength is negative it will give off an output of an invalid time value

Sprint-2/3-mandatory-interpret/3-to-pounds.js

@@ -24,4 +24,9 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
-// 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 1. const penceString = "399p": initialises a string variable with the value "399p" representing the price in pence including the trailing letter 'p'
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): Extract the numeric portion of the penceString by taking characters from index 0 up to the last character removing the 'p'
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP . padStart(3, "0"): it ensures the penceString is at least 3 digits long by adding leading zeros if necessary
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): Extracts the pounds portion of the price by taking all digits except the last 2
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2) padEnd(2, "0") it extracts the last 2 digits representing pence ensuring it is padded to 2 digits
+// 6. line 18 = formats and prints the final price string with the pound symbol, amount, period and pence amount