Glasgow | 26-ITP-Jan| Martin McLean | Sprint 1 | coursework

Sprint-1/1-key-exercises/1-count.js

@@ -4,3 +4,5 @@ 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 takes the initial value of count and adds 1 to it
+// the = "count + 1 rewrites the count variable to the newly calculated value"

Sprint-1/1-key-exercises/2-initials.js

@@ -5,7 +5,7 @@ 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 = ``;
-
-// https://www.google.com/search?q=get+first+character+of+string+mdn
+let initials = `${firstName.charAt(0)}${middleName.charAt(0)}${lastName.charAt(0)}`;
+console.log(initials);
 
+// https://www.google.com/search?q=get+first+character+of+string+mdn

Sprint-1/1-key-exercises/3-paths.js

@@ -12,12 +12,18 @@
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
 const base = filePath.slice(lastSlashIndex + 1);
-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 firstSlashIndex = filePath.indexOf("/");
+const dir = filePath.slice(firstSlashIndex + 1, lastSlashIndex - 1);
 
-// https://www.google.com/search?q=slice+mdn
+const lastdotindex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastdotindex);
+
+console.log(`The base part of ${filePath} is ${base}
+The dir is ${dir} 
+and the ext is ${ext}`);
+
+// https://www.google.com/search?q=slice+mdn

Sprint-1/1-key-exercises/4-random.js

@@ -1,9 +1,10 @@
-const minimum = 1;
-const maximum = 100;
+const minimum = 80;
+const maximum = 83;
 
 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
+console.log(num);

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?
+/*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?
+
+comment them out!*/

Sprint-1/2-mandatory-errors/1.js

@@ -1,4 +1,7 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+console.log(age);
+
+// it needed to be a variabal not a constant

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}`);
+// the constant was declared after the sentence that used it

Sprint-1/2-mandatory-errors/3.js

@@ -1,9 +1,12 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
-
+console.log(last4Digits);
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // Before running the code, make and explain a prediction about why the code won't work
 // 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
+
+
+//it will not work because the cardNumber is a number and not a string so it cant use the slice method

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,17 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+//const twelveHourClockTime = "20:53";
+//const twentyFourHourClockTime = "08:53";
+
+//variable names can't start with a number
+
+// the times are in the wrong places ie:-20:53 is not a twelve hour time and as they are const they cant be directly changed
+
+let twelveHourClockTime = "20:53";
+let twelthHour = twelveHourClockTime.substring(0, twelveHourClockTime.length -3);
+    if (twelthHour >12) {twelthHour = twelthHour - 12};
+let twelthMinutes = twelveHourClockTime.substring(2, twelveHourClockTime.length)
+
+let twentyFourHourClockTime = "08:53";
+
+
+console.log(`${twelthHour}${twelthMinutes}`);
+console.log(twentyFourHourClockTime);

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;
@@ -13,10 +13,19 @@ console.log(`The percentage change is ${percentageChange}`);
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
 
+// carPrice = Number(carPrice.replaceAll(",", ""));
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+//      both use a call to read the string as a number and to replaceAll the comas with a null value
+
+
 // 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 on line 5 there should be a coma after the "," to make the change
 
 // c) Identify all the lines that are variable reassignment statements
+//      lines 5 and 6 reassign the variables from the string to a number so that we can do a calculation on it 
 
 // d) Identify all the lines that are variable declarations
+//      lines 1, 2, 7 and 8 
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//      it is changing the string "10,000" to a number and removing the comma so it can be used in the calculation

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 4; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,19 @@ 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 declarations
 
 // b) How many function calls are there?
-
+//      0
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+//      it divides the first operand (number) by the second operand and returns the remainder 
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//      line 4 subtracts the remaining seconds so the we can work with the whole Minutes  
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+//      result gives us a string literal with the results of the calculation perhaps a better name would be runLength or watchTime
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// i have went from high (2254:56:54) to low (0:1:24) and it seems to work for any number.

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -1,21 +1,21 @@
-const penceString = "399p";
+const penceString = "392p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
-);
+); //39772
 
-const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); //39772
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
-);
+); // 397
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
+  .padEnd(2, "0"); // 72
 
-console.log(`£${pounds}.${pence}`);
+console.log(`£${pounds}.${pence}`); // 397.72
 
 // This program takes a string representing a price in pence
 // The program then builds up a string representing the price in pounds
@@ -24,4 +24,17 @@ 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 to 6.const penceStringWithoutTrailingP = penceString.substring(0,penceString.length - 1);
+//  removes the (p) at the end determined by removing the sudstring at the total length of the string -1
+
+// 8.const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//    makes sure the string is at least 3 characters long and if it is not it padds it with "0"
+
+// 9.const pounds = paddedPenceNumberString.substring( 0, paddedPenceNumberString.length - 2);
+//     gets the ammout of pounds by making a sub string that starts at the firts character (0) to the paddedPenceNumberString length -2 to exclued the last 2 characters (the p)
+
+// 10.
+// 18.console.log(`£${pounds}.${pence}`);
+//      gives the console the result using a string literal

Sprint-1/4-stretch-explore/chrome.md

@@ -9,10 +9,13 @@ 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?
+a pop up appered  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?
+it give a pop up eith a text input 
 What is the return value of `prompt`?
+the return is what is entred into the text input 

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?
-
+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, …}assert: ƒ assert()clear: ƒ clear()context: ƒ context()count: ƒ count()countReset: ƒ countReset()createTask: ƒ createTask()debug: ƒ debug()dir: ƒ dir()dirxml: ƒ dirxml()error: ƒ error()group: ƒ group()groupCollapsed: ƒ groupCollapsed()groupEnd: ƒ groupEnd()info: ƒ info()log: ƒ log()memory: MemoryInfo {totalJSHeapSize: 12700000, usedJSHeapSize: 10000000, jsHeapSizeLimit: 2330000000}profile: ƒ profile()profileEnd: ƒ profileEnd()table: ƒ table()time: ƒ time()timeEnd: ƒ timeEnd()timeLog: ƒ timeLog()timeStamp: ƒ timeStamp()trace: ƒ trace()warn: ƒ warn()length: 0name: "warn"arguments: (...)caller: (...)[[Prototype]]: ƒ ()[[Scopes]]: Scopes[0]Symbol(Symbol.toStringTag): "console"[[Prototype]]: Object[[Prototype]]: Object
 
 Try also entering `typeof console`
+'object'
 
 Answer the following questions:
 
 What does `console` store?
+the console stores objects
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+the . denotes what kind of object the console is being told to use and what to do with the data it has been given