From 739e416977c759f3c368775b58933faf2a39c763 Mon Sep 17 00:00:00 2001 From: RomanSanaye Date: Wed, 11 Feb 2026 11:45:06 +0000 Subject: [PATCH 1/5] 1-key-exercises are done --- Sprint-1/1-key-exercises/1-count.js | 3 +++ Sprint-1/1-key-exercises/2-initials.js | 6 +++++- Sprint-1/1-key-exercises/3-paths.js | 13 +++++++++---- Sprint-1/1-key-exercises/4-random.js | 6 ++++++ 4 files changed, 23 insertions(+), 5 deletions(-) diff --git a/Sprint-1/1-key-exercises/1-count.js b/Sprint-1/1-key-exercises/1-count.js index 117bcb2b6..6e091340f 100644 --- a/Sprint-1/1-key-exercises/1-count.js +++ b/Sprint-1/1-key-exercises/1-count.js @@ -4,3 +4,6 @@ count = count + 1; // Line 1 is a variable declaration, creating the count variable with an initial value of 0 // Describe what line 3 is doing, in particular focus on what = is doing + +// Line 3 is assigning (count + 1) to the variable count. +// In other word adding 1 to the variable count. \ No newline at end of file diff --git a/Sprint-1/1-key-exercises/2-initials.js b/Sprint-1/1-key-exercises/2-initials.js index 47561f617..d33d79669 100644 --- a/Sprint-1/1-key-exercises/2-initials.js +++ b/Sprint-1/1-key-exercises/2-initials.js @@ -5,7 +5,11 @@ let lastName = "Johnson"; // Declare a variable called initials that stores the first character of each string. // This should produce the string "CKJ", but you must not write the characters C, K, or J in the code of your solution. -let initials = ``; +let initials = `${firstName.charAt(0)}${middleName.charAt(0)}${lastName.charAt(0)}`; +console.log(initials); +console.log(typeof initials); // https://www.google.com/search?q=get+first+character+of+string+mdn +// I used the mdn documentation to know how to get the first character of a string. +// I used charAt() method that takes the index of a string and return the character of it. diff --git a/Sprint-1/1-key-exercises/3-paths.js b/Sprint-1/1-key-exercises/3-paths.js index ab90ebb28..076f3322f 100644 --- a/Sprint-1/1-key-exercises/3-paths.js +++ b/Sprint-1/1-key-exercises/3-paths.js @@ -11,13 +11,18 @@ const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt"; const lastSlashIndex = filePath.lastIndexOf("/"); -const base = filePath.slice(lastSlashIndex + 1); +const base = filePath.slice(-8); console.log(`The base part of ${filePath} is ${base}`); // Create a variable to store the dir part of the filePath variable // Create a variable to store the ext part of the variable -const dir = ; -const ext = ; +const dir = filePath.slice(0, -8); +const ext = filePath.slice(filePath.length-3); -// https://www.google.com/search?q=slice+mdn \ No newline at end of file +console.log(`the dir part of filePath variable is ${dir}`); +console.log(ext); + +// https://www.google.com/search?q=slice+mdn + +// After studying the slice() method I was able to do this task easily. \ No newline at end of file diff --git a/Sprint-1/1-key-exercises/4-random.js b/Sprint-1/1-key-exercises/4-random.js index 292f83aab..f70a1aca6 100644 --- a/Sprint-1/1-key-exercises/4-random.js +++ b/Sprint-1/1-key-exercises/4-random.js @@ -2,8 +2,14 @@ const minimum = 1; const maximum = 100; const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum; +console.log(num); // In this exercise, you will need to work out what num represents? // 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 + +// num is a variable that will be assigned an integer number after the operators are done. +// Math.floor() rounds a decimal to its nearest number to make it an integer. ex = 1.2 => 1. +// Math.random() is a method used to create numbers between (0-1) and usually it creates a decimal like (0,2) or etc. +// each time I run it, I got different number as Math.random() generates different number each time we run it. \ No newline at end of file From f71288bb771930b78d1ef30bd0f79372ad13c733 Mon Sep 17 00:00:00 2001 From: RomanSanaye Date: Wed, 11 Feb 2026 13:27:19 +0000 Subject: [PATCH 2/5] Mandatory errors were fixed and Explained --- Sprint-1/2-mandatory-errors/0.js | 8 +++++++- Sprint-1/2-mandatory-errors/1.js | 8 +++++++- Sprint-1/2-mandatory-errors/2.js | 6 +++++- Sprint-1/2-mandatory-errors/3.js | 11 ++++++++++- Sprint-1/2-mandatory-errors/4.js | 12 +++++++++++- 5 files changed, 40 insertions(+), 5 deletions(-) diff --git a/Sprint-1/2-mandatory-errors/0.js b/Sprint-1/2-mandatory-errors/0.js index cf6c5039f..680eec82d 100644 --- a/Sprint-1/2-mandatory-errors/0.js +++ b/Sprint-1/2-mandatory-errors/0.js @@ -1,2 +1,8 @@ + 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? \ No newline at end of file +We don't want the computer to run these 2 lines - how can we solve this problem? + +//solution: Simply comment the lines. +// 1- single line comment like: // example ... +// 2- multiline comment like : /* a, b, c */ +// comments are for instruction of guidance of who will read our codes, but the computer wont read them. \ No newline at end of file diff --git a/Sprint-1/2-mandatory-errors/1.js b/Sprint-1/2-mandatory-errors/1.js index 7a43cbea7..9ca368df0 100644 --- a/Sprint-1/2-mandatory-errors/1.js +++ b/Sprint-1/2-mandatory-errors/1.js @@ -1,4 +1,10 @@ // trying to create an age variable and then reassign the value by 1 const age = 33; -age = age + 1; +//age = age + 1; + +// we can't do that with const variable, because JS locks the reference. +// the best choice is to use "let" variable. +let age2 = 33; +age2 = age2 + 1; // or age++ if wanna increase by "1"; +console.log(age2); diff --git a/Sprint-1/2-mandatory-errors/2.js b/Sprint-1/2-mandatory-errors/2.js index e09b89831..d851e72c3 100644 --- a/Sprint-1/2-mandatory-errors/2.js +++ b/Sprint-1/2-mandatory-errors/2.js @@ -1,5 +1,9 @@ // Currently trying to print the string "I was born in Bolton" but it isn't working... // what's the error ? -console.log(`I was born in ${cityOfBirth}`); const cityOfBirth = "Bolton"; +console.log(`I was born in ${cityOfBirth}`); + //const cityOfBirth = "Bolton"; + +// the problem is that our variable is not declared when we print it. +// to make it work, we should declare our "cityOfBirth" variable before we print it. diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js index ec101884d..9f05fb1a3 100644 --- a/Sprint-1/2-mandatory-errors/3.js +++ b/Sprint-1/2-mandatory-errors/3.js @@ -1,5 +1,14 @@ const cardNumber = 4533787178994213; -const last4Digits = cardNumber.slice(-4); +//const last4Digits = cardNumber.slice(-4); +let str = cardNumber.toString().slice(-4); +const last4Digits = Number(str); +console.log(`${last4Digits} is the last 4 digits of ${cardNumber}`); + +//console.log(typeof last4Digits); + +// 1- the code is not working because 'slice()' method is not working with numbers. +// 2- it gives "type error" cardNumber.slice is not a function. +// 3- my prediction was correct as I studied the slice method and knew it. // The last4Digits variable should store the last 4 digits of cardNumber // However, the code isn't working diff --git a/Sprint-1/2-mandatory-errors/4.js b/Sprint-1/2-mandatory-errors/4.js index 21dad8c5d..34e30245c 100644 --- a/Sprint-1/2-mandatory-errors/4.js +++ b/Sprint-1/2-mandatory-errors/4.js @@ -1,2 +1,12 @@ +/* const 12HourClockTime = "20:53"; -const 24hourClockTime = "08:53"; \ No newline at end of file +const 24hourClockTime = "08:53"; +*/ +// As far as I know we can not start a variable name with a number in JS. +// Therefore these variables throw error. +// we can start the name of a variable with letters a-z, A-Z, _ ,and $ . +// This is how we correctly name our variables: +const twelveHourClockTime = "20:53"; +const twenty4HourClockTime = "08:53"; +console.log(`Twelve-hour clock: ${twelveHourClockTime}`); +console.log(`24-hour clock: ${twenty4HourClockTime}`); From bb852dd9bc61513e470ba5088a81656e5061c71d Mon Sep 17 00:00:00 2001 From: RomanSanaye Date: Wed, 11 Feb 2026 17:59:15 +0000 Subject: [PATCH 3/5] Mandatory interprets are done --- .../1-percentage-change.js | 12 ++++---- .../3-mandatory-interpret/2-time-format.js | 15 ++++++---- Sprint-1/3-mandatory-interpret/3-to-pounds.js | 29 ++++++++++--------- 3 files changed, 32 insertions(+), 24 deletions(-) diff --git a/Sprint-1/3-mandatory-interpret/1-percentage-change.js b/Sprint-1/3-mandatory-interpret/1-percentage-change.js index e24ecb8e1..1e346b6db 100644 --- a/Sprint-1/3-mandatory-interpret/1-percentage-change.js +++ b/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 +12,13 @@ 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 - + // line: 4 and line 5 and it is replaceAll(). // 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? - + // error is coming from line 5. The error is because of not putting comma between the inputs of replaceAll function. + // To fix the problem just add a comma between the inputs of replaceAll function. // c) Identify all the lines that are variable reassignment statements - + // Line 4 and 5. // d) Identify all the lines that are variable declarations - + // we have variable declarations at lines 1, 2, 7 and 8. // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression? + // the purpose of that expression is to turn into number the string and replace all commas with an empty space. \ No newline at end of file diff --git a/Sprint-1/3-mandatory-interpret/2-time-format.js b/Sprint-1/3-mandatory-interpret/2-time-format.js index 47d239558..0cb4f84de 100644 --- a/Sprint-1/3-mandatory-interpret/2-time-format.js +++ b/Sprint-1/3-mandatory-interpret/2-time-format.js @@ -1,4 +1,4 @@ -const movieLength = 8784; // length of movie in seconds +const movieLength = 8724; // length of movie in seconds const remainingSeconds = movieLength % 60; const totalMinutes = (movieLength - remainingSeconds) / 60; @@ -12,14 +12,17 @@ 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? - + // we have 6 variable declarations. // b) How many function calls are there? - + // here we have only one which is console.log(). // c) Using documentation, explain what the expression movieLength % 60 represents // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators - + // Remainder operator (%), returns the leftover when one operand divided by the other operand. + // movieLength % 60 expression represents the remaining seconds. // d) Interpret line 4, what does the expression assigned to totalMinutes mean? - + // that expression turns the seconds into minutes. // e) What do you think the variable result represents? Can you think of a better name for this variable? - + // the result variable represents the movie length in Hour, minutes and seconds. + // a better name can be "movieLength". // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer + // as I changed the value of the movieLength the results has changed too.It means this code works with any value. \ No newline at end of file diff --git a/Sprint-1/3-mandatory-interpret/3-to-pounds.js b/Sprint-1/3-mandatory-interpret/3-to-pounds.js index 60c9ace69..ff190904e 100644 --- a/Sprint-1/3-mandatory-interpret/3-to-pounds.js +++ b/Sprint-1/3-mandatory-interpret/3-to-pounds.js @@ -1,21 +1,16 @@ const penceString = "399p"; -const penceStringWithoutTrailingP = penceString.substring( - 0, - penceString.length - 1 -); +const penceStringWithoutTrailingP = +penceString.substring(0, penceString.length - 1); // => "399"; -const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); -const pounds = paddedPenceNumberString.substring( - 0, - paddedPenceNumberString.length - 2 -); +const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); // => "399"; +const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2); // => "3" const pence = paddedPenceNumberString - .substring(paddedPenceNumberString.length - 2) - .padEnd(2, "0"); + .substring(paddedPenceNumberString.length - 2) // => "99" + .padEnd(2, "0"); -console.log(`£${pounds}.${pence}`); +console.log(`£${pounds}.${pence}`); // => "3.99" // This program takes a string representing a price in pence // The program then builds up a string representing the price in pounds @@ -24,4 +19,12 @@ console.log(`£${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": initializes a string variable with the value "399p" +// 2. const penceStringWithoutTrailingP uses the substring()method to remove the last character. +// 3. const paddedPenceNumberString tries to add "0" at the beginning, but the length is already 3; so it does nothing. +// Its worthy to talk about padStart() method. we use this to add a character at the beginning of a string. +// 4. const pound uses the substring() method on paddedPenceNumberString variable and remove its last two characters.Its value ll be "3". +// 5. const pence uses substring() on paddedPenceNumberString variable and take its length and then subtract it with 2 ... +// which will remain like this .substring(1), so it take the index 1 till the last which is only one more index that its character is 9 ... +// so the final value ll be "99". then uses padEnd( 2, "0") that can not add "0" at the end, as we set the length "2". +// 6. Lastly, we print the value of our pound and pence variable. which is "3.99". \ No newline at end of file From 242fca7e925a25cf25e4ba19b4df7e8898e7fd4a Mon Sep 17 00:00:00 2001 From: RomanSanaye Date: Wed, 11 Feb 2026 19:53:59 +0000 Subject: [PATCH 4/5] Answere the questions in objects.md --- Sprint-1/4-stretch-explore/objects.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Sprint-1/4-stretch-explore/objects.md b/Sprint-1/4-stretch-explore/objects.md index 0216dee56..d5d99192d 100644 --- a/Sprint-1/4-stretch-explore/objects.md +++ b/Sprint-1/4-stretch-explore/objects.md @@ -13,4 +13,11 @@ Try also entering `typeof console` Answer the following questions: What does `console` store? + +`Answer` => console stores methods(function) that you can call to perform actions like logging, warning, or displaying error. + What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean? + +`console.log()` prints the out put. +`console.assert()` checks the condition. +`The dot operator` is called member access. It accesses a property or method of an object. \ No newline at end of file From 38532cfe124c970e5d1809599883bce23c3e0db8 Mon Sep 17 00:00:00 2001 From: RomanSanaye Date: Wed, 11 Feb 2026 20:03:42 +0000 Subject: [PATCH 5/5] Answered the question about 'alert & prompt' --- Sprint-1/4-stretch-explore/chrome.md | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Sprint-1/4-stretch-explore/chrome.md b/Sprint-1/4-stretch-explore/chrome.md index e7dd5feaf..fb7ab6868 100644 --- a/Sprint-1/4-stretch-explore/chrome.md +++ b/Sprint-1/4-stretch-explore/chrome.md @@ -12,7 +12,12 @@ invoke the function `alert` with an input string of `"Hello world!"`; What effect does calling the `alert` function have? +`answer` // there ll be a pop-up box showing a message and ask us to press ok in order to get rid of it. + Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`. What effect does calling the `prompt` function have? +`answer` // Here we also have a pop-up box with an input, and it asks the user to type something. + What is the return value of `prompt`? +`answer` // if the user type something it returns `string` if the user cancel it then it return `null`.