All exercises in 3-mandatory-interpret completed

Author: burhan-mustafa

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;
@@ -12,11 +12,12 @@ 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: There are 5 function calls on lines 4, 5 and 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: line 5 there is a comma missing in the replaceAll parameters.
 // 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: Lines 1, 2, 7 and 8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// Answer: It removes all the commas from the string carPrice and turns it into a number that can be used in calculations

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = "839f"; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -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: There is 6 variable declarations
 // b) How many function calls are there?
-
+// Answer: There is one function call on 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: this finds the remainder of movieLength when its divided by 60
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
-// e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// Answer: The expressions uses the modulo function to work out the remainder value which in this case works out the remaining seconds of the total movie length
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Answer:  No it only works as intended when a Non negative integer is used however when Decimal, negative, or string values it does not work as intended.
+// Decimal values will display decimal seconds, which does not cause an error, but the output may not be in the expected time format.
+// Negative values will produce negative time values, and string values may produce NaN if they cannot be converted into a number.

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -25,3 +25,22 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// 3–6. const penceStringWithoutTrailingP takes the initial constant variable with the value of "399p" and uses the substring function to make a new string
+//     without the "p". It uses the .length property to return the number of characters in the string and subtracts 1 so that substring stops before the last
+//     character, which will always remove the "p".
+
+// 8.  the next variable paddedPenceNumberString takes the previous string which only has number characters and checks if it is made up of three characters if it is not it
+//     is padded with "0" at the start of the string till there are three characters the reason for this is the minimum amount of characters needed to represent pounds and
+//     pence can be represented by is 3.
+
+//// 9-12. The next variable pounds takes the previous variable paddedPenceNumberString and uses the substring function to create a new string without the last
+//     two characters. It uses .length - 2 to stop before the final two characters because those characters represent the pence leaving only the characters
+//     that represent the pounds.
+
+// 14-16. The next variable pence takes paddedPenceNumberString and uses the substring function starting from two characters before the end of the string.
+//     This creates a new string containing only the final two characters which represent the pence. The padEnd function then adds "0" to the end of the
+//     string until it contains two characters making sure that the pence is always displayed using two digits.
+
+// 18. The console.log uses a template literal to combine the pound sign with the pounds and pence variables. A decimal point is placed between the two
+//     variables so that the final value is displayed as a price in pounds, for example "£3.99".