Manchester | ITP-May-2026 | Szidonia Bodo | Sprint 1 | Coursework Exercises by bodoszidi · Pull Request #1417 · CodeYourFuture/Module-Structuring-and-Testing-Data

bodoszidi · 2026-06-27T17:32:52Z

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

to explain the code line by line

Questions

…lready existing variables

…ng the string

cjyuan · 2026-07-02T01:50:32Z

+// Line 3, we reassign a new value to the count variable,
+// the new value is count plus 1.


Operation like count = count + 1 is very common in programming, and there is a programming term describing such operation.

Could you find out what one-word programming term describes the operation on line 3?

The term would be incrementing ++ or if it's the opposite, decrementing --

cjyuan · 2026-07-02T01:53:44Z

+const dir = filePath.slice(1, 16);
+const ext = filePath.slice(-4);
+console.log(`The base part of ${dir} is ${ext}`);


Could you make these statements to work for any valid path? For example, they could still work correctly if we changed line 12 to

const filePath = "/Users/jacknguyen448/cyf/Module-2/Sprint-1/package.json";

Yes, if we use the already created slash index and create a new dot index, the file path length can change at any point. The code below will find the "/" and the "." and we no longer need to count the length of our filepath:
const lastDotIndex = filePath.lastIndexOf(".")
const dir = filePath.slice(0, lastSlashIndex);
const ext = filePath.slice(lastDotIndex + 1);

cjyuan · 2026-07-02T01:57:31Z

+
 // 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
+// num = Math.floor which will remove all the numbers after the decimal point 


Could you look up the differences among Math.round(), Math.trunc(), Math.floor(), Math.ceil()?
All of these functions remove the decimal part of a number, but in different manner.

Math.round() - rounds the number to the nearest -> .1 - .4 ⬇️ & .5 - .9 ⬆️
Math.trunc() - removes all the numbers after the decimal point - without rounding the number
Math.floor() - rounds down and returns the largest integer less than or equal to a given number. rounding the number down ⬇️
Math.ceil() - rounds the given number to the smallest integer greater than or equal to a given number. rounding the number ⬆️

The above answer I gave was actually correct for Math.trunc() - Math.floor() will actually round the number to the largest integer less than or equal to the given number - if we have a negative integer, we would get the lower number back, as Math.floor(-3.03) would return -4

Your approach is correct, and you are right that either Math.trunc() or Math.floor() works. I just want you to be aware of different math functions.

cjyuan · 2026-07-02T02:00:42Z

+// (Math.random that will generate a random decimal number 
+// which will be times with the value of maximum - minimum + 1 + minimum ) 
+// which is 100 * the Math.random generated


Math.random() returns a random number within a range.

Could you describe what each of these expressions does, and the range of the numbers it may produce?

Math.random()

Math.random() * (maximum - minimum + 1)

Math.floor(Math.random() * (maximum - minimum + 1))

Math.floor(Math.random() * (maximum - minimum + 1)) + minimum

Note: To describe a range of numbers, we could use the math interval notation:

[, ] => inclusion

(, ) => exclusion

For example, [1, 10) means, all numbers between 1 and 10, including 1 but excluding 10.

Math.random() - generates a decimal number between [0, 1] - but excluding 1

Math.random() * (maximum - minimum + 1) - the generated decimal number * 100 - [0, 100]

Math.floor(Math.random() * (maximum - minimum + 1)) - the generated decimal number * 100 - Math.floor() round the number to the nearest lower number - [0, 99]

Math.floor(Math.random() * (maximum - minimum + 1)) + minimum

(the generated decimal * 100) +1 - Math.floor() round the number to the nearest lower number [1, 100]

cjyuan · 2026-07-02T02:01:13Z

+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);


Suppose you were not allowed to modify the statement const cardNumber = 4533787178994213;
(that is, keep the variable's value unchanged).
How would you modify the code (through type conversion) to still being able to use .slice(-4) to extract the last 4 digits from the given number.

If I can't modify the number would need to be converted to a string:
const cardNumber = 4533787178994213
const cardNumberString = cardNumber.toString()
const last4Digit = cardNumberString.slice(-4)

or

const cardNumber = 4533787178994213
const last4Digit = cardNumber.toString().slice(-4)

cjyuan · 2026-07-02T02:04:34Z

+// there is 5 calls: 2* Number() 2* .replaceAll() AND 1* .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?
+// line 5 missing a comma: .replaceAll("," "")


We could more precisely describe "A comma is missing between "," and "" in the function call" as:
A comma is missing between the ___________s.

What is this programming term that refers to the values passed to a function? It begins with an 'a'.

The comma is missing between the two arguments "," and ""

cjyuan · 2026-07-02T02:05:31Z

+// to calculate the movie length into minutes

 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// the result represent the movie length - hours minutes and second in a string - movieTime


The name movieTime does not quite indicate the value stored in the variable
is a formatted string in the form "2:12:02".

Could you suggest a more descriptive name?

movieLengthFormatted - would represent the value in a clearer way, also would indicate to the given variable movieLength - but in a formatted output

cjyuan · 2026-07-02T02:06:31Z

-What is the return value of `prompt`?
+What effect does calling the `prompt` function have? - the prompt will also display a message usually question  - however this time you will have an empty field to enter the value or answer - a cancel and a OK button
+
+What is the return value of `prompt`? - whatever the user inputs into the empty field


What if the a enters something and then click "Cancel" instead of "OK?

If the user cancels the prompt, the returned value will be null.

cjyuan · 2026-07-02T21:38:20Z

Well done addressing all comments, and they are all correct.

bodoszidi added 15 commits June 21, 2026 19:46

explained the variable declaration

fa0f428

created a new variable to assign the string first characters of the a…

aaf910d

…lready existing variables

using the slice method added the value to der and ext variable

be2aedf

updated the value inside the dir and ext variables

49a51a7

explaining Math.random()

0e64290

pseudo code is the answer

eac1ebb

updated the variable to be able to reassign the value

3a4947c

fixed the bug on the code - the variable wasn't declared before loggi…

ef80dd1

…ng the string

using slice method to have display only the required amount

2ca0d04

updated the variable name

176f6b7

filled the questionary

3231276

completed the exercises

9080a92

explained the code line by line

7dd742e

alert & prompt

3c4f80e

console object

25702d2

bodoszidi added 📅 Sprint 1 Assigned during Sprint 1 of this module Needs Review Trainee to add when requesting review. PRs without this label will not be reviewed. Module-Structuring-And-Testing-Data The name of the module. labels Jun 29, 2026

cjyuan reviewed Jul 2, 2026

View reviewed changes

cjyuan added Reviewed Volunteer to add when completing a review with trainee action still to take. and removed Needs Review Trainee to add when requesting review. PRs without this label will not be reviewed. labels Jul 2, 2026

bodoszidi added Needs Review Trainee to add when requesting review. PRs without this label will not be reviewed. and removed Reviewed Volunteer to add when completing a review with trainee action still to take. labels Jul 2, 2026

cjyuan added Complete Volunteer to add when work is complete and all review comments have been addressed. and removed Needs Review Trainee to add when requesting review. PRs without this label will not be reviewed. labels Jul 2, 2026

		// Line 3, we reassign a new value to the count variable,
		// the new value is count plus 1. No newline at end of file

		const cardNumber = "4533787178994213";
		const last4Digits = cardNumber.slice(-4);

Uh oh!

Uh oh!

Conversation

bodoszidi commented Jun 27, 2026

Learners, PR Template

Changelist

Questions

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

cjyuan commented Jul 2, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

2 participants