Sprint 1 ia done.

Author: HannaOdud

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
+//Answer:
+//In line 3 to existing variable count assigned new value = old value of variable + 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 = `${firstName.charAt(0)}+${middleName.charAt(0)}+${lastName.charAt(0)}}`;
+    let initials = `${firstName.charAt(0)+middleName.charAt(0)+lastName.charAt(0)}`;
+    console.log(`The initials are: ${initials}`)
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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

@@ -11,13 +11,17 @@
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
+console.log(`Last slash index ${lastSlashIndex}`)
 const base = filePath.slice(lastSlashIndex + 1);
+console.log(`Base: ${base}`)
 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 + 1);
+console.log(`The dir part is: ${dir}`);
+const ext = console.log(`The ext part is: ${filePath.slice(-3)}`) ;
 
 // https://www.google.com/search?q=slice+mdn

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
+console.log(num)
+
+//Explenation:
+
+// Math.random - generates a random number (could be anything like: 0,1-0,750 etc in the range from 0(inclusive) to 1 (exclusive));
+// Math.floar - rounds the number to the closest integer;
+// Consequently, given expression on line 4 gives us a random round number in the range from minimum to maximum.

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?
+We don't want the computer to run these 2 lines - how can we solve this problem?
+
+//We have to add " // "

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

@@ -2,3 +2,5 @@
 
 const age = 33;
 age = age + 1;
+
+// declared variable is const which means that can't be changed (Should be assigned like "let age");

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

@@ -3,3 +3,5 @@
 
 console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+
+//The variable declaration should be on the beginning

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

@@ -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
+
+
+//Explenation: method Slice is valid for String type.
+//we need to change a type:
+//const last4Digits = cardNumber.toString.slice(-4);

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

@@ -1,2 +1,4 @@
 const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const 24hourClockTime = "08:53";
+
+//Explenation: the name of value in  JS can not start with numbers.

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 +12,13 @@ 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
-
+    //4,5
 // 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?
-
+    //
 // c) Identify all the lines that are variable reassignment statements
-
+    //4,5
 // d) Identify all the lines that are variable declarations
-
+    //1,2,7,8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+    // we replace all commas into "". Then, we convert variable CarPrice into Integer, because it was String. 
+    // The purpose of this action is next step of calculation.