diff --git a/Sprint-1/1-key-exercises/1-count.js b/Sprint-1/1-key-exercises/1-count.js index 117bcb2b6e..b150e6b932 100644 --- a/Sprint-1/1-key-exercises/1-count.js +++ b/Sprint-1/1-key-exercises/1-count.js @@ -4,3 +4,7 @@ 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 + +// = is assigning the value of 'count', +// 'let' is a declararation than enables its subject (count) to be changed +// line 3 is taking the current value in line 1 (0) and by using '=' it is reassigning the value of 'count' to equal itself plus 1 \ 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 47561f6175..108e2e500a 100644 --- a/Sprint-1/1-key-exercises/2-initials.js +++ b/Sprint-1/1-key-exercises/2-initials.js @@ -4,8 +4,13 @@ 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. +const firstInitial = firstName .charAt(0); +const middleInitial = middleName .charAt(0); +const lastInitial = lastName .charAt(0); -let initials = ``; +let initials = firstInitial + middleInitial + lastInitial; + +console.log(initials); // 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 ab90ebb28e..6c29bfc48a 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); +console.log(`The dir part of ${filePath} is ${dir}`); +const lastDotIndex = filePath.lastIndexOf("."); +const ext = filePath.slice(lastDotIndex + 1 ) +console.log(`The ext part of ${filePath} is ${ext}`); // https://www.google.com/search?q=slice+mdn \ 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 292f83aabb..8292edd4a3 100644 --- a/Sprint-1/1-key-exercises/4-random.js +++ b/Sprint-1/1-key-exercises/4-random.js @@ -7,3 +7,10 @@ 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 + +//Math.floor - rounds the number to the nearest integer (whole number) +//Math.random - generates a random number between 0 (inclusive) and 1 (exclusive) +//1. The first caluculation is Math.random * maximum (100) - minimum (1) + 1 +//2. The next calculation is Math.floor of the result of the first calculation +//3. The final calculation is adding the minimum (1) to the result of the second calculation +// Due to the use of Math.random, the value of num will be different each time the program is run, but it will always be a whole number between 1 and 100 diff --git a/Sprint-1/2-mandatory-errors/0.js b/Sprint-1/2-mandatory-errors/0.js index cf6c5039f7..6a7a7f6908 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? \ 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 7a43cbea76..1866aff639 100644 --- a/Sprint-1/2-mandatory-errors/1.js +++ b/Sprint-1/2-mandatory-errors/1.js @@ -1,4 +1,6 @@ // trying to create an age variable and then reassign the value by 1 -const age = 33; +let age = 33; age = age + 1; + +//changed 'const' to 'let' which makes it able to change diff --git a/Sprint-1/2-mandatory-errors/2.js b/Sprint-1/2-mandatory-errors/2.js index e09b89831d..19e1afeeed 100644 --- a/Sprint-1/2-mandatory-errors/2.js +++ b/Sprint-1/2-mandatory-errors/2.js @@ -1,5 +1,6 @@ // 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"; +//Spelling Error - cityofBirth is misspelled as cityOfBirth in the console.log statement. \ No newline at end of file diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js index ec101884db..2ea344d130 100644 --- a/Sprint-1/2-mandatory-errors/3.js +++ b/Sprint-1/2-mandatory-errors/3.js @@ -1,4 +1,4 @@ -const cardNumber = 4533787178994213; +const cardNumber = "4533787178994213"; const last4Digits = cardNumber.slice(-4); // The last4Digits variable should store the last 4 digits of cardNumber @@ -7,3 +7,8 @@ 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 + +//Prediction: I believe the code won't work because the slice method is incorrect. The slice method is used for strings. +//Error: TypeError: cardNumber.slice is not a function +//Needed to add "" to make it a string. + diff --git a/Sprint-1/2-mandatory-errors/4.js b/Sprint-1/2-mandatory-errors/4.js index 5f86c730bc..a2783dd17c 100644 --- a/Sprint-1/2-mandatory-errors/4.js +++ b/Sprint-1/2-mandatory-errors/4.js @@ -1,2 +1,4 @@ -const 12HourClockTime = "8:53pm"; -const 24hourClockTime = "20:53"; +const twelveHourClockTime = "8:53pm"; +const twentyfourHourClockTime = "20:53"; + +//changed '12' to 'twelve' and '24' to 'twentyfour' in order to fix the error. \ No newline at end of file diff --git a/Sprint-1/3-mandatory-interpret/1-percentage-change.js b/Sprint-1/3-mandatory-interpret/1-percentage-change.js index e24ecb8e18..51345d809f 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 +//There are 5 function calls on lines 4,5,7,8 and 10 // 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 Column 60 was missing a ',' to separate the fuction. // c) Identify all the lines that are variable reassignment statements +//LInes 4 and 5 are variable reassignment statements. // d) Identify all the lines that are variable declarations +//Lines 1 and 2 are variable declarations. // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression? +//This is removing the commas to convert the string into a number for equations diff --git a/Sprint-1/3-mandatory-interpret/2-time-format.js b/Sprint-1/3-mandatory-interpret/2-time-format.js index 47d2395587..bc4dfe21d9 100644 --- a/Sprint-1/3-mandatory-interpret/2-time-format.js +++ b/Sprint-1/3-mandatory-interpret/2-time-format.js @@ -12,14 +12,20 @@ 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? +// There are 6 variable declarations in this program: movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, and result. // b) How many function calls are there? +// There are 5 function calls in this program: On lines 3,4 6,7 and 9. // c) Using documentation, explain what the expression movieLength % 60 represents // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators +//movie % 60 represents the remainder of the division of movielenght by 60. // d) Interpret line 4, what does the expression assigned to totalMinutes mean? +// The expression is an Assignment operator that assigns its right hand side value and equation to the variable on the left hand side. // e) What do you think the variable result represents? Can you think of a better name for this variable? +// The variable result represents the total hours,minutes and seconds of the movie. A better name for this could be runtime or duration. // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer +// This code will not work for values of movielength that are less than 60 seconds due to it needing to divide by 60 to get minuetes and hours. diff --git a/Sprint-1/3-mandatory-interpret/3-to-pounds.js b/Sprint-1/3-mandatory-interpret/3-to-pounds.js index 60c9ace69a..c58d187bf9 100644 --- a/Sprint-1/3-mandatory-interpret/3-to-pounds.js +++ b/Sprint-1/3-mandatory-interpret/3-to-pounds.js @@ -25,3 +25,8 @@ console.log(`£${pounds}.${pence}`); // To begin, we can start with // 1. const penceString = "399p": initialises a string variable with the value "399p" +// 2. penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): removes the trailing "p". +// 3. paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): pads the number with leading zeros to ensure it has at least 3 digits. +// 4. pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): Determines that the 'pound' is the first part of the string. +// 5. pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): Determines that the 'pence' is the last two digits of the string. +// 6. console.log(`£${pounds}.${pence}`): Outputs the final formatted string representing the price in pounds and pence. diff --git a/Sprint-1/4-stretch-explore/chrome.md b/Sprint-1/4-stretch-explore/chrome.md index e7dd5feafe..52e6a381c6 100644 --- a/Sprint-1/4-stretch-explore/chrome.md +++ b/Sprint-1/4-stretch-explore/chrome.md @@ -10,7 +10,8 @@ Let's try an example. In the Chrome console, invoke the function `alert` with an input string of `"Hello world!"`; -What effect does calling the `alert` function have? +What effect does calling the `alert` function have? +// The alert function stops the previous input, citing errors and requires it to be fixed 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`.