exercise 1-complete

Author: Yonas Gebre

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
+// it updates the value of Count variable by addiing 1 to its current value.
+// count value hold 1
+

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

@@ -5,7 +5,9 @@ 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]}`;
+initials = initials.toUpperCase();
+console.log(initials);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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 =filePath.slice(filePath.lastIndexOf(".")); 
+console.log(`The dir part of ${filePath} is ${dir}`);
+console.log(`The ext part of ${filePath} is ${ext}`);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -1,7 +1,19 @@
 const minimum = 1;
 const maximum = 100;
 
-const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
+// const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
+let range = maximum - minimum + 1;
+let rand = Math.random() ; // generates a random number between 0 and 1 (not including 1)
+let rand100 = rand * range; // generates a random number between 0 and 100 (not including 100)
+let rand99 = Math.floor(rand100); // generates a random number between 0 and 99 (not including 100)
+const num = rand99 + minimum;
+
+
+
+console.log(`The random number between 0 and 1   is ${rand}`); 
+console.log(`The random number between 0 and 100 is ${rand100}`);
+console.log(`The  random number mutipled with range is  ${rand99}`);
+console.log(`The random number is ${num} between ${minimum} and ${maximum}`);
 
 // 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

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?
+//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?

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;
+//const age = 33; we should change to let age = 33; to allow reassignment
+let age = 33;
 age = age + 1;

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 ?
+// what's the error ? in line 4 the variable cityOfBirth is being used before it is declared. We should declare the variable before using it in the console.log statement.
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+

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

@@ -1,9 +1,15 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+//const last4Digits = cardNumber.slice(-4);
 
 // 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
+
+// the code is not working becuase slide method is for strings where as cardNumber is a number. We should convert the cardNumber to string before using slice method.
+//Synax error in line 2, but the result is not clear from the output.
+
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(`The last 4 digits of ${cardNumber} are ${last4Digits}`);

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

@@ -1,2 +1,3 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const HourClockTime12 = "8:53pm";
+const hourClockTime24 = "20:53";
+// valid identifier don't start with a number 

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

@@ -3,18 +3,23 @@ const penceString = "399p";// initialises a string variable with the value "399p
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
-);// removes the last character "p" from the penceString and stores the result in a new variable called penceStringWithoutTrailingP. The substring method is used to extract a portion of the string, starting from index 0 and ending at the second-to-last index (length - 1).
+);
+// The substring method is used to extract a portion of the string, starting from index 0 and ending at the second-to-last index (length - 1).
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
-//padStart method is used to add leading zeros to the penceStringWithoutTrailingP until it reaches a length of 3 characters. The result is stored in a new variable called paddedPenceNumberString.
+//padStart method is used to add leading zeros to the penceStringWithoutTrailingP until it reaches a length of 3 characters
+//  The result is stored in a new variable called paddedPenceNumberString.
+//esure that to represent like 0.09 or 3.99
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
-//
+//slice the paddedPenceNumberString until the last two characters, which represent the pounds.
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
+  //slice the last two characters of the paddedPenceNumberString, which represent the pence.
+  // by using penEnd method esure the it is two characters long. if it is not add zeros to end.
 
 console.log(`£${pounds}.${pence}`);
 
@@ -26,3 +31,14 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): 
+// removes the last character "p" from the penceString and stores the result in a new variable called penceStringWithoutTrailingP.
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): 
+// adds leading zeros to the penceStringWithoutTrailingP until it reaches a length of 3 characters. 
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): 
+// it like slicing , until the last two of the paddedPenceNumberString that represents the pounds.
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): 
+// takes the last two characters 
+// the panEnd method esure the it is two characters long. if it is not add zeros to end.
+// 6. console.log(`£${pounds}.${pence}`): 
+// Final result in console in the format of pounds and pence.