sprint 1 course work

Author: mjm-git185

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
+
+
+// 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 +5,8 @@ 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)
 
 // 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 +1,9 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
-age = age + 1;
+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