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Sprint-2/3-mandatory-interpret Expand file tree Collapse file tree Original file line number Diff line number Diff line change @@ -2,7 +2,7 @@ let carPrice = "10,000";
22let priceAfterOneYear = "8,543" ;
33
44carPrice = Number ( carPrice . replaceAll ( "," , "" ) ) ;
5- priceAfterOneYear = Number ( priceAfterOneYear . replaceAll ( "," "" ) ) ;
5+ priceAfterOneYear = Number ( priceAfterOneYear . replaceAll ( "," , "" ) ) ;
66
77const priceDifference = carPrice - priceAfterOneYear ;
88const percentageChange = ( priceDifference / carPrice ) * 100 ;
@@ -12,11 +12,12 @@ console.log(`The percentage change is ${percentageChange}`);
1212// Read the code and then answer the questions below
1313
1414// a) How many function calls are there in this file? Write down all the lines where a function call is made
15-
15+ // 4, 5, 8
1616// b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
17-
17+ // It was a syntax error, it can be fixed by adding the missing part (1 of 2 parentheses)
1818// c) Identify all the lines that are variable reassignment statements
19-
19+ // 4, 5
2020// d) Identify all the lines that are variable declarations
21-
21+ // 1, 2
2222// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
23+ // It turns/converts a string into a number by removing the comma and quotation marks (since they are non-number values)
Original file line number Diff line number Diff line change 1- const movieLength = 8784 ; // length of movie in seconds
1+ const movieLength = 2 ; // length of movie in seconds
22
33const remainingSeconds = movieLength % 60 ;
44const totalMinutes = ( movieLength - remainingSeconds ) / 60 ;
@@ -7,19 +7,25 @@ const remainingMinutes = totalMinutes % 60;
77const totalHours = ( totalMinutes - remainingMinutes ) / 60 ;
88
99const result = `${ totalHours } :${ remainingMinutes } :${ remainingSeconds } ` ;
10- console . log ( result ) ;
10+ console . log ( result ) ;
1111
1212// For the piece of code above, read the code and then answer the following questions
1313
1414// a) How many variable declarations are there in this program?
15-
15+ // 6
1616// b) How many function calls are there?
17-
17+ // 5
1818// c) Using documentation, explain what the expression movieLength % 60 represents
1919// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
20+ // The remainder operator calculates the remainder of movie in seconds (it does it by dividing the number by 60)
2021
2122// d) Interpret line 4, what does the expression assigned to totalMinutes mean?
22-
23+ // total minutes (in seconds) - remaining seconds = remaining seconds. Then converts the seconds into minutes
2324// e) What do you think the variable result represents? Can you think of a better name for this variable?
24-
25+ // It represents how much of the movie is left to watch. Maybe something like remainderOfTheMovie
2526// f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
27+ // It won't work with all values. Most importantly, the value must be strictly numeric
28+
29+
30+
31+ console . log ( result )
Original file line number Diff line number Diff line change @@ -24,4 +24,15 @@ console.log(`£${pounds}.${pence}`);
2424// Try and describe the purpose / rationale behind each step
2525
2626// To begin, we can start with
27- // 1. const penceString = "399p": initialises a string variable with the value "399p"
27+ // 1. const penceString = "399p": initializes a string variable with the value "399p"
28+ // 3-6. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1);
29+ // : initializes a variable, the value of which is turned to numerical by removing the letter "p".
30+ // 8. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
31+ // Here the padstart function turns "399" string into 399 number (it could add some zeroes in front, but here it serves as a converter)
32+ // 9-12. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
33+ // Here the goal is to initialize a variable of Pounds (with the value of 3), by splitting it from 99, and it's done using the substring method
34+ // 14-16. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
35+ // Here the pence variable is introduced with the value of 99 and it's done by taking the 399 and removing 3 using substring and padEnd methods.
36+
37+
38+
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