Cpt | Jan2025 | Evelyn Nomsa Mwanunura | Module-Structuring-and-Testing-Data | Sprint 1

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

@@ -1,5 +1,5 @@
 let count = 0;
-
+//the = is reassigning the new value  to the variable count of count
 count = count + 1;
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0

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
+)}`;
+console.log(initials);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
-

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

@@ -8,6 +8,7 @@
 // └──────┴──────────────┴──────┴─────┘
 
 // (All spaces in the "" line should be ignored. They are purely for formatting.)
+const path = require("node:path");
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
@@ -17,7 +18,11 @@ 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 = path.dirname(filePath);
+const ext = path.extname(filePath);
 
-// https://www.google.com/search?q=slice+mdn
+console.log(lastSlashIndex);
+console.log(dir);
+console.log(ext);
+
+// https://www.google.com/search?q=slice+mdn

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

@@ -1,8 +1,11 @@
 const minimum = 1;
 const maximum = 100;
+/*First, the num variable generates a random number, which is then multiplied by the maximum value. 
+The result is rounded down using Math.floor to obtain a whole number, and finally, the minimum value is added.*/
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
+console.log(num);
 // 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

Sprint-1/2-mandatory-errors/0.js

@@ -1,2 +1,3 @@
-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?*/
+//to solve the problem you just comment out the lines.

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;
+console.log(age);

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

@@ -2,4 +2,5 @@
 // what's the error ?
 
 console.log(`I was born in ${cityOfBirth}`);
+//you cannot console log a variable that hasn't been assigned yet because the program runs from the top to bottom.
 const cityOfBirth = "Bolton";

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

@@ -1,5 +1,7 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
+//the code did not work because the .slice can only be used on a string and not a number
+console.log(last4Digits);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working

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

@@ -1,2 +1,5 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const _12HourClockTime = "20:53";
+const _24hourClockTime = "08:53";
+
+console.log(_12HourClockTime);
+//a variable cannot start with a number

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -12,11 +12,17 @@ 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 is 1 function call.
 
 // 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?
+        /*line 5 has a error. The error is occuring because there us a missing comma after the the first double quotations. 
+        You can fix the error by just adding the comma.*/
 
 // c) Identify all the lines that are variable reassignment statements
+        //line 4 and 5
 
 // d) Identify all the lines that are variable declarations
+        //line 1,2,7 and 8.
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+        //the expression is removing the ,.

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

@@ -12,14 +12,21 @@ 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 declarations in the program.
 
 // b) How many function calls are there?
+//there is 1 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 declaration represents the remainder when we devide the movie legth by 60
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//line 4 is subtracting the remainingMinutes from totalMinutes then dividing that by 60 to get the the total hours.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+/*the variable result is returning time format that shows the remaining hours, minutes and seconds left in the movie.
+        Better name for the variable could be remainingTime.*/
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//the code works for all values of movie length.

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

@@ -25,3 +25,25 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// 2. the const penceStringWithoutTrailingP = penceString.substring( 0,  penceString.length - 1,
+/*the substring(0) retuns 399p because substring (0) is the same as copying the entire string as it has no
+    end parameter it will extract from start to end and 
+    the length -1 with remove the last character meaning this whole code will return 399.*/
+
+// 3. the const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0")
+/* pedStart(3, "0") represent the number of characters a string should have in this case 3, and if the string dont meet the number of characters
+    the start of the string will be filled with "0". But in this case the string length is already 3, therefor there 
+    the padStart will not change anything*/
+
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2
+/* What this code is doing is first calling the operator substring, but since the method has no end parameter 
+      it will extract the whole string, after that the length -2 operator is called which removes the last 2 characters of the string so
+      that the whole code returns "3" */
+
+// 5. const pence = paddedPenceNumberString  .substring(paddedPenceNumberString.length - 2)  .padEnd(2, "0")
+/*  What this code is doing is firstly it will extract the last 2 characters of the string and 
+      padEnd makes sure that the string has atleast 2 charaters which it does. Therefore this will return "99" */
+
+// 6. console.log(`£${pounds}.${pence}`)
+// this retuns 3.99

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

@@ -12,7 +12,14 @@ invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
 
+- There was a pop up at the top of the screen that says "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?
+
+- There was a pop up that prompted me to enter my name.
+
 What is the return value of `prompt`?
+
+- it displays a dialog that prompts user to enter a value.

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

@@ -6,11 +6,23 @@ Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
 
+- this was the output "ƒ log() { [native code] }"
+
 Now enter just `console` in the Console, what output do you get back?
 
+- this was the output "console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}"
+
 Try also entering `typeof console`
 
+- It returned "object"
+
 Answer the following questions:
 
 What does `console` store?
+
+- It stores debugging methods like, log, error, assert.
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+- console.log means outputting information to the console.
+  -console.assert means to perform a conditional check in JavaScript, where it logs an error message to the console only if a specified condition are false.

Sprint-1/readme.md

@@ -12,7 +12,7 @@ This README will guide you through the different sections for this week.
 
 ## 1 Exercises
 
-In this section, you'll have a short program and task. Some of the syntax may be unfamiliar - in this case, you'll need to look things up in documentation. 
+In this section, you'll have a short program and task. Some of the syntax may be unfamiliar - in this case, you'll need to look things up in documentation.
 
 https://developer.mozilla.org/en-US/docs/Web/JavaScript
 
@@ -28,7 +28,7 @@ You must use documentation to make sense of anything unfamiliar - learning how t
 
 You can also use `console.log` to check the value of different variables in the code.
 
-https://developer.mozilla.org/en-US/docs/Web/JavaScript 
+https://developer.mozilla.org/en-US/docs/Web/JavaScript
 
 ## 4 Explore - Stretch 💪