Birmingham | 26-ITP-Jan | Tasleem Adedokun | sprint 1| Structure and Testing Data

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

@@ -4,3 +4,4 @@ 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 is reassigning the variable count to a new value.Taking it current value adding 1 to it and storing the result back into count.

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 = ``;
+let initials = firstName.charAt(0) + middleName.charAt(0) + lastName.charAt(0);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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

@@ -17,7 +17,12 @@ 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 lastDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDotIndex);
+
+
+
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,21 @@ 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
+
+
+
+//Math.random() returns a random number/ decimal number between 0 (inclusive),  and 1 (exclusive).
+
+//Math.random() always returns a number lower than 1.
+
+// * (maximum - minimum + 1) multiplying by this is to give a range of possible values.
+
+// adding the minimum at the end is to give a range value between the minimum and maximum inclusive.
+
+// Math.floor usually rounds the number down  to the nearest integer. 
+
+console.log (num); // first print is 24
+console.log (num); // second print 3
+console.log (num); // third print is 17
+console.log (num); // fourth print is 70
+console.log (num); // fifth print is 7

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

@@ -1,2 +1,9 @@
-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.
+
+//SyntaxError: Unexpected identifier 'is' that was the error after i ran node.
+// I think javascript is trying run them word for word and found is in an unfamiliar place.
+// could also be that its trying to run is as a code which is not correct.
+
+/* To make this correct we can add a double line(//) before the statement to make it a single line comment,
+or we can add a line and asterisk  before and after to make it a double line  comment */ 

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

@@ -2,3 +2,17 @@
 
 const age = 33;
 age = age + 1;
+
+//TypeError: Assignment to constant variable.
+// here we already have a variable constant age=33, now we are trying to reassign the variable constant.
+
+// to enable this work, we can say;
+let age = 33;
+age = age + 1;
+
+console.log(age); //34 
+//this will be a way to fix error.
+
+
+
+

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

@@ -3,3 +3,7 @@
 
 console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+
+
+//ReferenceError: Cannot access 'cityOfBirth' before initialization
+// you always need to declare a variable before using it.

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

@@ -1,9 +1,18 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
+
+
+console.log(last4Digits); // "4213"
 
 // 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
+
+
+/* I don't think it will work, because card number is a number,
+and .slice() is a string method and we must convert the number to string method to work*/
+
+//TypeError: cardNumber.slice is not a function. this was after running node.

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

@@ -1,2 +1,11 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const Hour12ClockTime = "20:53";
+const hour24ClockTime = "08:53";
+
+console.log(Hour12ClockTime); //"20;53"
+console.log(hour24ClockTime); // "08:53"
+
+// SyntaxError: Invalid or unexpected token.
+// variable names cannot start with number.
+
+// renaming our variable would be the right thing.
+

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

@@ -20,3 +20,14 @@ console.log(`The percentage change is ${percentageChange}`);
 // d) Identify all the lines that are variable declarations
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+
+// a) 5 function calls. 2 in line 4, 2 in line 5, and 1 in line 10.
+
+// b) SyntaxError: missing ) after argument list. There is a missing comma after argument. It can be fixed by adding a comma.
+
+// c) line 4 and 5.
+
+// d) line 1,2, 7, and 8.
+
+// e)  The expression is used to remove commas from the string and convert it into a number so it can be used in calculations.

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = -8784; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -23,3 +23,20 @@ console.log(result);
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+
+
+// a) 6 variables declarations.
+
+// b) 1 function call.
+
+/* c) The remainder (%) operator returns the remainder left over when one operand is divided by a second operand. It always takes the sign of the dividend.
+In this case it will give the remainder of 8748 % 60 */
+
+// d) It simply wants to get the length of the movie in minutes. subtract the remaining seconds from the movie length and convert to minutes.
+
+// e) It represents the movie durations in hours, minutes and seconds. (movie duration).
+
+/*f) I have tried three values and it worked. It will work perfectly for larger and smaller numbers.
+However, with negative values it gives negative figures.*/ 
+

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

@@ -25,3 +25,13 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// 2.line 3-6 function is trying to remove  the p and make the strings numeric only.
+
+// 3.line 8 ensure there are three characters and can split equally to pounds and pence.
+
+// 4.line 9-12 this is extracting pounds from the number.
+
+// 5.line 14-16 ensure the pence always have 2 digits.
+
+// line 18 gives the value in pounds and pence.

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

@@ -16,3 +16,9 @@ Now try invoking the function `prompt` with a string input of `"What is your nam
 
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+
+
+line 13- when i ran the function on console tab, it showed a new word hello world in  the next line.
+
+line 17&18 - when i ran  the 'prompt' function it pop up a box for imputing my name  and it returned undefined.
+after i wrote myname in the next line it brought out my name.

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

@@ -14,3 +14,17 @@ Answer the following questions:
 
 What does `console` store?
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+line 7 =ƒ log() { [native code] }
+
+line 9 = console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
+
+line 11 = 'object'
+
+
+line 15 =console is like an object that helps to store methods used for debugging and printing output in the browser’s developer tools.
+
+
+ line 16 = 'console.log'means access or get the log function fom the object console. 
+           'console.assert' means access or get the assert function from the object console.
+           while the '.' is an access operator that access methods or properties from and object.