diff --git a/Sprint-1/1-key-exercises/1-count.js b/Sprint-1/1-key-exercises/1-count.js index 117bcb2b6e..11a6faa739 100644 --- a/Sprint-1/1-key-exercises/1-count.js +++ b/Sprint-1/1-key-exercises/1-count.js @@ -4,3 +4,4 @@ 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 reassigning the value of the variable, = sign is used to reassign the value of count to increment by 1. diff --git a/Sprint-1/1-key-exercises/2-initials.js b/Sprint-1/1-key-exercises/2-initials.js index 47561f6175..4ad18c1b5c 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 = `${firstName.charAt(0)}${middleName.charAt(0)}${lastName.charAt(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 ab90ebb28e..0f9501a82c 100644 --- a/Sprint-1/1-key-exercises/3-paths.js +++ b/Sprint-1/1-key-exercises/3-paths.js @@ -16,8 +16,10 @@ 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 secondCharacterIndex = 1; +const startingPointForExtension = filePath.lastIndexOf("."); -const dir = ; -const ext = ; - -// https://www.google.com/search?q=slice+mdn \ No newline at end of file +const dir = filePath.slice(secondCharacterIndex, lastSlashIndex); +const ext = filePath.slice(startingPointForExtension + 1); +console.log(`The dir part of ${filePath} is ${dir} and the ext part is ${ext}`); +// https://www.google.com/search?q=slice+mdn diff --git a/Sprint-1/1-key-exercises/4-random.js b/Sprint-1/1-key-exercises/4-random.js index 292f83aabb..d96f4a428b 100644 --- a/Sprint-1/1-key-exercises/4-random.js +++ b/Sprint-1/1-key-exercises/4-random.js @@ -1,9 +1,12 @@ -const minimum = 1; -const maximum = 100; - +const [min, max] = [1, 100]; const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum; // 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 represents a number in [1, 100] and Math.random() returns a number in [0, 1). +Math.floor is a method that rounds a number down to the nearest whole number. +first of all i will try to get a value [0, 1) from Math.random and multiple it by 100 +and apply Math.floor to the result which will give me the integer number and then add the minimum value i.e. 1 */ diff --git a/Sprint-1/2-mandatory-errors/0.js b/Sprint-1/2-mandatory-errors/0.js index cf6c5039f7..a852506e40 100644 --- a/Sprint-1/2-mandatory-errors/0.js +++ b/Sprint-1/2-mandatory-errors/0.js @@ -1,2 +1,4 @@ -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? */ + +/*when we try to write comment and instruction and we want the computer not to run it we can comment them using // for single line and /* for multiple lines. */ diff --git a/Sprint-1/2-mandatory-errors/1.js b/Sprint-1/2-mandatory-errors/1.js index 7a43cbea76..1a732302a7 100644 --- a/Sprint-1/2-mandatory-errors/1.js +++ b/Sprint-1/2-mandatory-errors/1.js @@ -1,4 +1,5 @@ // trying to create an age variable and then reassign the value by 1 -const age = 33; +let age = 33; age = age + 1; +// To reassign a value of age we have to use let not const. diff --git a/Sprint-1/2-mandatory-errors/2.js b/Sprint-1/2-mandatory-errors/2.js index e09b89831d..d06c83e0fd 100644 --- a/Sprint-1/2-mandatory-errors/2.js +++ b/Sprint-1/2-mandatory-errors/2.js @@ -1,5 +1,7 @@ // 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}`); + +//the code try to log the variable before declaring the variable +// if we declare and initialize the variable first then we can use it. diff --git a/Sprint-1/2-mandatory-errors/3.js b/Sprint-1/2-mandatory-errors/3.js index ec101884db..6cbe259b3b 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 = cardNumber.toString().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 +/* the code is not working because of the variable type which is .slice method work on +string and array variable types not on number variable types to fix it we can change the variable type to +string variable type by adding double quotation marks to the variable.*/ diff --git a/Sprint-1/2-mandatory-errors/4.js b/Sprint-1/2-mandatory-errors/4.js index 21dad8c5d1..ffa17acb56 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 hourClockTime12 = "20:53"; +const hourClockTime24 = "08:53"; + +// Numbers are not allowed as the first character in naming of variables. diff --git a/Sprint-1/3-mandatory-interpret/1-percentage-change.js b/Sprint-1/3-mandatory-interpret/1-percentage-change.js index e24ecb8e18..e156ed8861 100644 --- a/Sprint-1/3-mandatory-interpret/1-percentage-change.js +++ b/Sprint-1/3-mandatory-interpret/1-percentage-change.js @@ -12,11 +12,26 @@ 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 in this code. + 1) Number(carPrice.replaceAll(",","")); line 4. + 2) Number(priceAfterOneYear.replace("," "")) line 5. + 3) carPrice.replaceAll(",", "") line 4. + 4) priceAfterOneYear.replaceAll("," "") line 5. + 5) console.log(`The percentage change is ${percentageChange}`); line 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? +//the error is coming from line 5 and the error is missing between the arguments. // c) Identify all the lines that are variable reassignment statements +/*on line 4- carPrice = Number(carPrice.replaceAll(",", "")); + on line 5- priceAfterOneYear = Number(priceAfterOneYear.replaceAll(","), "")*/ // d) Identify all the lines that are variable declarations +/* line 1- let carPrice = "10,000"; + line 2- let priceAfterOneYear = "8,543"; + line 7- const priceDifference = carPrice - priceAfterOneYear; + line 8- const percentageChange = (priceDifference / carPrice) * 100;*/ // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression? +/* the expression doing changing the value of "10,000" to "10000" because comma count as part of a character after that + changing the string variable type to number variable type. */ diff --git a/Sprint-1/3-mandatory-interpret/2-time-format.js b/Sprint-1/3-mandatory-interpret/2-time-format.js index 47d2395587..ba408d6091 100644 --- a/Sprint-1/3-mandatory-interpret/2-time-format.js +++ b/Sprint-1/3-mandatory-interpret/2-time-format.js @@ -12,14 +12,23 @@ 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 declaration. // b) How many function calls are there? +// there is only one function call. // 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 represents the returns of the remainder after dividing one number by another + in this case 8784 % 60 and it return the remainder 24. */ // d) Interpret line 4, what does the expression assigned to totalMinutes mean? +//This expression calculates the total full minutes in the movie by removing leftover seconds and converting seconds to minutes. // e) What do you think the variable result represents? Can you think of a better name for this variable? +//result represent the total movie length using hours,minutes and seconds,the better name can be movieRunTime. // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer +/*the code works for different values of movieLength it present the input movieLength by calculating the remainder and subtracting +it with the initial input and using the method for the finding of the value for the rest of the variables and assign the values withe +the variables of hours,minutes and seconds */ diff --git a/Sprint-1/3-mandatory-interpret/3-to-pounds.js b/Sprint-1/3-mandatory-interpret/3-to-pounds.js index 60c9ace69a..c9f09a3055 100644 --- a/Sprint-1/3-mandatory-interpret/3-to-pounds.js +++ b/Sprint-1/3-mandatory-interpret/3-to-pounds.js @@ -1,4 +1,4 @@ -const penceString = "399p"; +const penceString = "340210p"; const penceStringWithoutTrailingP = penceString.substring( 0, @@ -14,7 +14,6 @@ const pounds = paddedPenceNumberString.substring( const pence = paddedPenceNumberString .substring(paddedPenceNumberString.length - 2) .padEnd(2, "0"); - console.log(`£${pounds}.${pence}`); // This program takes a string representing a price in pence @@ -24,4 +23,26 @@ console.log(`£${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 = penceString.substring( + 0, + penceString.length - 1 + ); : this part of the code have two steps, + - inside assigning of variable there is a function call that replace the string "399p" by "399" + - then assigning the variable penceStringWithoutTrailingP with new string "399" */ + +/* 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); this initializes new string value that have + 3 character if it's less than 3 it will add "0" in front of the string.*/ + +/* 4. const pounds = paddedPenceNumberString.substring( + 0, + paddedPenceNumberString.length - 2 + ); : this part of the code assigning const pound with value of string that length is + reduced by -2 . */ + +/* 5. const pence = paddedPenceNumberString + .substring(paddedPenceNumberString.length - 2) + .padEnd(2, "0"); : let's break it down this code parts it have two steps first one is .substring(paddedPenceNumberString.length - 2) + Takes the last 2 characters of the string and the second is .padEnd(2, "0") Ensures the result + is at least length 2 if the length less than 2 it will add 0 at the end of the string. */