From 1cf9289be90ae446f943fae900564703b2c3f4e6 Mon Sep 17 00:00:00 2001 From: Mohsen Zamani Date: Sun, 25 Jan 2026 23:47:10 +0000 Subject: [PATCH] Sprint-1 --- Sprint-1/1-key-exercises/1-count.js | 3 +++ Sprint-1/1-key-exercises/2-initials.js | 3 +-- Sprint-1/1-key-exercises/3-paths.js | 8 +++++--- Sprint-1/1-key-exercises/4-random.js | 4 ++++ Sprint-1/2-mandatory-errors/0.js | 4 ++-- Sprint-1/2-mandatory-errors/1.js | 4 ++-- Sprint-1/2-mandatory-errors/2.js | 2 +- Sprint-1/2-mandatory-errors/3.js | 5 ++++- Sprint-1/2-mandatory-errors/4.js | 6 ++++-- Sprint-1/3-mandatory-interpret/1-percentage-change.js | 7 ++++++- Sprint-1/3-mandatory-interpret/2-time-format.js | 9 ++++++++- Sprint-1/3-mandatory-interpret/3-to-pounds.js | 7 +++++++ Sprint-1/4-stretch-explore/chrome.md | 3 +++ Sprint-1/4-stretch-explore/objects.md | 5 +++++ 14 files changed, 55 insertions(+), 15 deletions(-) diff --git a/Sprint-1/1-key-exercises/1-count.js b/Sprint-1/1-key-exercises/1-count.js index 117bcb2b6..5a90f6459 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 adding 1 to the variable count and assign it again to count using =. +// So after line 3 the value of count is 1. diff --git a/Sprint-1/1-key-exercises/2-initials.js b/Sprint-1/1-key-exercises/2-initials.js index 47561f617..9f5dbcc82 100644 --- a/Sprint-1/1-key-exercises/2-initials.js +++ b/Sprint-1/1-key-exercises/2-initials.js @@ -5,7 +5,6 @@ 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 = `${firstName[0]}${middleName[0]}${lastName[0]}`; // https://www.google.com/search?q=get+first+character+of+string+mdn - diff --git a/Sprint-1/1-key-exercises/3-paths.js b/Sprint-1/1-key-exercises/3-paths.js index ab90ebb28..4b15e756b 100644 --- a/Sprint-1/1-key-exercises/3-paths.js +++ b/Sprint-1/1-key-exercises/3-paths.js @@ -17,7 +17,9 @@ 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, lastSlashIndex); +const ext = base.split(".")[1]; -// https://www.google.com/search?q=slice+mdn \ No newline at end of file +// https://www.google.com/search?q=slice+mdn +console.log(dir); +console.log(ext); diff --git a/Sprint-1/1-key-exercises/4-random.js b/Sprint-1/1-key-exercises/4-random.js index 292f83aab..f858d58eb 100644 --- a/Sprint-1/1-key-exercises/4-random.js +++ b/Sprint-1/1-key-exercises/4-random.js @@ -7,3 +7,7 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum; // 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 + +console.log(num); + +// minimum <= num => maximum diff --git a/Sprint-1/2-mandatory-errors/0.js b/Sprint-1/2-mandatory-errors/0.js index cf6c5039f..044add7ac 100644 --- a/Sprint-1/2-mandatory-errors/0.js +++ b/Sprint-1/2-mandatory-errors/0.js @@ -1,2 +1,2 @@ -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 +// 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? diff --git a/Sprint-1/2-mandatory-errors/1.js b/Sprint-1/2-mandatory-errors/1.js index 7a43cbea7..d919e07d8 100644 --- a/Sprint-1/2-mandatory-errors/1.js +++ b/Sprint-1/2-mandatory-errors/1.js @@ -1,4 +1,4 @@ // trying to create an age variable and then reassign the value by 1 -const age = 33; -age = age + 1; +let age = 33; +age = 1; diff --git a/Sprint-1/2-mandatory-errors/2.js b/Sprint-1/2-mandatory-errors/2.js index e09b89831..2865eb8a4 100644 --- a/Sprint-1/2-mandatory-errors/2.js +++ b/Sprint-1/2-mandatory-errors/2.js @@ -1,5 +1,5 @@ // 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}`); diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js index ec101884d..d90e96a9e 100644 --- a/Sprint-1/2-mandatory-errors/3.js +++ b/Sprint-1/2-mandatory-errors/3.js @@ -1,5 +1,5 @@ const cardNumber = 4533787178994213; -const last4Digits = cardNumber.slice(-4); +const last4Digits = String(cardNumber).slice(-4); // The last4Digits variable should store the last 4 digits of cardNumber // However, the code isn't working @@ -7,3 +7,6 @@ const last4Digits = cardNumber.slice(-4); // Then run the code and see what error it gives. // Consider: Why does it give this error? Is this what I predicted? If not, what's different? // Then try updating the expression last4Digits is assigned to, in order to get the correct value + +// slice is a string method but cardNumber is a number +console.log(Number(last4Digits)); diff --git a/Sprint-1/2-mandatory-errors/4.js b/Sprint-1/2-mandatory-errors/4.js index 21dad8c5d..cd01b0f3b 100644 --- a/Sprint-1/2-mandatory-errors/4.js +++ b/Sprint-1/2-mandatory-errors/4.js @@ -1,2 +1,4 @@ -const 12HourClockTime = "20:53"; -const 24hourClockTime = "08:53"; \ No newline at end of file +const twelveHourClockTime = "20:53"; +const twentyFourHourClockTime = "08:53"; + +// Variable names can not start with numbers diff --git a/Sprint-1/3-mandatory-interpret/1-percentage-change.js b/Sprint-1/3-mandatory-interpret/1-percentage-change.js index e24ecb8e1..78f659593 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 +12,16 @@ 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 +// 4 // 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. It is a syntaxError. string.replaceAll() is missing a ',' // c) Identify all the lines that are variable reassignment statements +// 4, 5 // d) Identify all the lines that are variable declarations +// 1, 2, 7, 8 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression? +// It is replacing all "," with ""(empty string) and turn it into a number data type diff --git a/Sprint-1/3-mandatory-interpret/2-time-format.js b/Sprint-1/3-mandatory-interpret/2-time-format.js index 47d239558..54b815b15 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 = 8784536346344.633; // length of movie in seconds const remainingSeconds = movieLength % 60; const totalMinutes = (movieLength - remainingSeconds) / 60; @@ -12,14 +12,21 @@ 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? +// 6 // b) How many function calls are there? +// 1 // c) Using documentation, explain what the expression movieLength % 60 represents // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators +// Divides movieLength by 60 and returns the remaining and assigns it to remainingSeconds // d) Interpret line 4, what does the expression assigned to totalMinutes mean? +// It is deducting remainingSeconds from movieLength(also in seconds) and divide the result by 60, so it turns into minutes +// and finally assign it to totalMinutes // e) What do you think the variable result represents? Can you think of a better name for this variable? +// The duration of movie, it can be renamed to movieDuration // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer +// With float numbers, it seems to need a rounding because the result seems ugly: 2:-26:-24.63299999999981 diff --git a/Sprint-1/3-mandatory-interpret/3-to-pounds.js b/Sprint-1/3-mandatory-interpret/3-to-pounds.js index 60c9ace69..f3b965f1a 100644 --- a/Sprint-1/3-mandatory-interpret/3-to-pounds.js +++ b/Sprint-1/3-mandatory-interpret/3-to-pounds.js @@ -25,3 +25,10 @@ console.log(`£${pounds}.${pence}`); // To begin, we can start with // 1. const penceString = "399p": initialises a string variable with the value "399p" +// 2. Using the String.substring method, cuts the trailing p out of the string +// 3. Using String.padStart method, makes the penceStringWithoutTrailingP to length of 3 +// by adding 0 to the left, if it is not length of 3 +// 4. Takes the first character of paddedPenceNumberString and assigns it to pounds +// 5. Takes from position 1 of paddedPenceNumberString to the end and makes it the length of 2 +// by adding 0 to the end and assigns it to pence +// 6. Prints the calculates pounds and pence diff --git a/Sprint-1/4-stretch-explore/chrome.md b/Sprint-1/4-stretch-explore/chrome.md index e7dd5feaf..b84a14a7c 100644 --- a/Sprint-1/4-stretch-explore/chrome.md +++ b/Sprint-1/4-stretch-explore/chrome.md @@ -11,8 +11,11 @@ In the Chrome console, invoke the function `alert` with an input string of `"Hello world!"`; What effect does calling the `alert` function have? +It opens an alert window in Chrome saying "Hello world!" 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? +Opens an alert window, but waits for an input What is the return value of `prompt`? +The name typed by user diff --git a/Sprint-1/4-stretch-explore/objects.md b/Sprint-1/4-stretch-explore/objects.md index 0216dee56..8b9856968 100644 --- a/Sprint-1/4-stretch-explore/objects.md +++ b/Sprint-1/4-stretch-explore/objects.md @@ -5,12 +5,17 @@ In this activity, we'll explore some additional concepts that you'll encounter i Open the Chrome devtools Console, type in `console.log` and then hit enter What output do you get? +ƒ log() { [native code] } Now enter just `console` in the Console, what output do you get back? +console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …} Try also entering `typeof console` +'object' Answer the following questions: What does `console` store? +It is an object, and includes some variables and functions called methods. What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean? +'.' helps to access the proberties of console object.