London | 26-ITP-May | Dipa Sarker | Sprint 1 | Coursework by Dipa-Sarker · Pull Request #1419 · CodeYourFuture/Module-Structuring-and-Testing-Data

Dipa-Sarker · 2026-06-28T10:41:20Z

Learners, PR Template

Self checklist

I have titled my PR with Region | Cohort | FirstName LastName | Sprint | Assignment Title
My changes meet the requirements of the task
I have tested my changes
My changes follow the style guide

Changelist

Completed all Exercises tasks.
Ran and explained the errors in the Errors section.
Interpreted the programs in the Interpret section.
Completed the Explore (Stretch) activity.
Tested the solutions locally before committing and pushing the changes.

Joshuafolorunsho · 2026-07-01T19:20:30Z

+// num stores the result of the expression after calculating it.
 // Try breaking down the expression and using documentation to explain what it means
-// It will help to think about the order in which expressions are evaluated
-// Try logging the value of num and running the program several times to build an idea of what the program is doing
+// There is a range of numbers from 1 to 100. In the expression, 
+// (maximum - minimum + 1) calculates the size of the possible integers, which is 100. 
+// The Math.random() function generates a random decimal number in the range 0 ≤ x < 1.
+// This random decimal is then multiplied by the range size to scale it to a
+// value between 0 and 100. The result is a floating-point number in this interval.
+// Next, Math.floor() is used to round the number down to the largest integer less than
+// or equal to the calculated value, producing an integer between 0 and 99.
+// Finally, by adding minimum, the range is shifted from 0–99 to 1–100, giving a random
+// integer within the required range.
+// I have run 5 times the program and this produces different values each time because
+// Math.random() generates a new random decimal number every time. 
+// Since the final value of num depends on this function, the result changes on each execution.


I really like how you have explained this.
Good job!

Joshuafolorunsho · 2026-07-01T19:34:30Z

+
+// We can solve this problem by writing those two lines as comments using //, 
+// because JavaScript ignores commented lines and they will not be executed by the computer.


This is correct, but doesn't quite solve the problem. If we were to run this file as it is, what will happen? Will the code compile?

I think I made mistakes to write single line comment correctly. I made correction in the file.

Thanks for looking at it again.

So I think you've got the objective of the section slightly wrong.
You obviously know what the problem is, as you have rightly explained.
However, the goal of the exercise is to apply that to the file.

i.e, Add the // to the start of each line.

Oh sorry! I think now I get the point and made the correction properly.

Joshuafolorunsho · 2026-07-01T19:44:50Z

+// There is a constant variable age, which is fixed and it's value cannot be reassigned.
+// If we want to change the value of age, we have to use let instead of const.


Your explanation is correct, however If we were to run the code as it is, will the code compile successfully?

I think I have made the same mistakes to write single line comment correctly. I made correction in the file.

Can we apply the fix to the problem? By changing line 2 to reflect your explanation.

Can you please explain this again? I cannot understand your question.

At the moment, if you run this, it will error out because we are trying to update a constant variable age. You've rightly explained the problem, and that we should let. What I was asking is to effect the change by updating line 2 to use let.

Oh! now I got it and replace const with let. Also, I was confused about the rules of single line comment. That's why I put // at the end of each line. Now I made correction to all the files.

Joshuafolorunsho · 2026-07-01T19:46:03Z

+// The variable const cityOfBirth = "Bolton"; needs to be declared at first. 
+// As it is not declared, JavaScript cannot find out the variable cityofBirth in console.log.


Another great explanation, however we need to actually fix the problem.

I think I made same mistakes again to write single line comment correctly. I made correction in the file.

Can we apply your explanation to this file?
I.e, move line 5 to maybe a different line?

I moved the line 5 (variable declaration line) before console.log and now I can see the output "I was born in Bolton".

Joshuafolorunsho · 2026-07-01T19:51:42Z

 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+console.log(cardNumber.toString());
+const cardNumber1 = cardNumber.toString()
+const last4Digits = cardNumber1.slice(-4); 
+console.log(last4Digits);


Really clever solution, I really like it!
Do you think we can find a better variable name for cardNumber1?

I thought the variable name could be "newcardNumber" or "formatcardNumber". I used "formatcardNumber".

I thought the variable name could be "newCardNumber" or "formatCardNumber". I used "formatCardNumber".

Much much better, well done!

Joshuafolorunsho · 2026-07-01T20:23:15Z


 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// The expression movieLength % 60 devides the movieLength by 60 seconds and return the reminder 


A small typo here: devides

Sorry for the typo. I made correction.

Joshuafolorunsho · 2026-07-01T20:26:11Z

+// The variable result reprents the movieLength in hours:minutes:seconds. The variable should be renamed by totalDuration.

 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// I have tried with 3 variables, 1515, 9999 & 70052. I observed that this code works succesfully with all the values


Curious to see if a negative number will work.
What do you think?

yes, negative numbers work. I tried with const movieLength = -1515; & it gives result 0:-25:-15 but this is not our requirment.

Joshuafolorunsho · 2026-07-01T20:27:02Z

 invoke the function `alert` with an input string of `"Hello world!"`;

 What effect does calling the `alert` function have?
+// `alert` function deisplays a popup dialogue box with a message and the user have to click 'ok' button. 


one small typo here: deisplays

fixed typo.

Joshuafolorunsho · 2026-07-01T20:59:50Z

+// There are 4 variable declarations lines. 
+// let carPrice = "10,000";
+// let priceAfterOneYear = "8,543";


Could you please highlight the lines where the declarations are?
I.e line 1,10, 20.

highlighted all 4 variable declaration lines.

Brilliant! You caught exactly what I wanted to see!
Previously, what you highlighted as variable reassignment weren't, but you have correctly identified them now. Very well done!

Joshuafolorunsho · 2026-07-01T21:02:34Z

+// const priceDifference = carPrice - priceAfterOneYear;
+// const percentageChange = (priceDifference / carPrice) * 100;


Not quite. These lines are declarations, not reassignments. Have another look at what makes a statement a reassignment.

Made corrections for variable reassignments.

Joshuafolorunsho · 2026-07-06T18:21:02Z

@@ -1,5 +1,9 @@
-// Currently trying to print the string "I was born in Bolton" but it isn't working...
-// what's the error ?
+// Currently trying to print the string "I was born in Bolton" but it isn't working... //


I noticed you added // at the end? Do we need it?

I explained in the previous comment and made correction.

Joshuafolorunsho · 2026-07-06T18:21:07Z

-// Currently trying to print the string "I was born in Bolton" but it isn't working...
-// what's the error ?
+// Currently trying to print the string "I was born in Bolton" but it isn't working... //
+// what's the error ? //


I noticed you added // at the end? Do we need it?

made correction.

Joshuafolorunsho · 2026-07-06T18:21:20Z

+
+
+// The variable const cityOfBirth = "Bolton"; needs to be declared at first. //
+// As it is not declared, JavaScript cannot find out the variable cityofBirth in console.log. //


I noticed you added // at the end? Do we need it?

made correction.

Joshuafolorunsho · 2026-07-06T18:22:10Z

+// This is just an instruction for the first activity - but it is just for human consumption //
+// We don't want the computer to run these 2 lines - how can we solve this problem? //
+
+// We can solve this problem by writing those two lines as comments using // 


I noticed you added // at the end? Do we need it?

made correction.

Joshuafolorunsho · 2026-07-06T18:22:31Z

+// This is just an instruction for the first activity - but it is just for human consumption //
+// We don't want the computer to run these 2 lines - how can we solve this problem? //


I noticed you added // at the end? Do we need it?

made correction.

Joshuafolorunsho

Well done!

Dipa-Sarker added 14 commits June 27, 2026 16:04

add explanation for line 3

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add printing option to see output

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create variables for dir and ext

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run the program several times to observe the results

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add solution

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fixed error in the problem

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fixed the error in the problem

d26014e

add answers

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fix errors

c267bf0

add answers to the questions

324b237

add answers for the questions

f5499b3

check code by running

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add answers with explanations

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add answers and explanations

2cb9c3a

Dipa-Sarker added the Needs Review Trainee to add when requesting review. PRs without this label will not be reviewed. label Jun 28, 2026