Birmingham | ITP-Jan-26 | Ayodeji Ayorinde | Sprint 1 | Structuring 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 adding 1 to the initial values of count which is 0 and reassing the new value (1+0 =1) to count

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

@@ -6,6 +6,8 @@ let lastName = "Johnson";
 // 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 = ``;
+initials = firstName.substring(0, 1) + middleName.substring(0, 1) + lastName.substring(0, 1)
+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 +17,10 @@ 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.substring(0, 44);
+console.log(`The dir part of the filePath variable is  ${dir}`);
 
+const lastDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDotIndex + 1);
+console.log(`The ext of ${filePath} is ${ext}`);
 // https://www.google.com/search?q=slice+mdn

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

@@ -1,2 +1,5 @@
-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?
+
+//ANSWER:
+//We change the two lines to comments by using double forward slash (//) at the beginning of the two lines.

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

@@ -2,3 +2,10 @@
 
 const age = 33;
 age = age + 1;
+
+// ANSWER
+// In the solution above, 'age' is a constant variable becuse the keyword 'const' was used with it hence the value cannot change.
+
+// Solution:
+let age = 33;
+let age = age + 1;

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

@@ -3,3 +3,11 @@
 
 console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+
+//ANSWER:
+// The 'cityOfBirth' was not assigned before the console.log statement
+// Solution will be to switch the lines as shown below:
+
+
+const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -7,3 +7,11 @@ 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
+
+//Predcition: slice() probably only work on string. Possible solution will be to put cardNumber in quotes or use String()
+// Why does it give this error? It says 'cardNumber.slice is not a function'
+// Is this what I predicted? No
+// If not, what's different? Since cardNumber is numeric, it shoulf be changed to string fot slice() to work.
+
+const cardNumber = "4533787178994213";
+const last4Digits = cardNumber.slice(-4);

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

@@ -1,2 +1,11 @@
 const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const 24hourClockTime = "08:53";
+
+//In naming variable, numbers are not allowed to preceed variable names.
+
+// Error message: An identifier or keyword cannot immediately follow a numeric literal.
+
+// SUggested Solutions:
+
+const ClockTime12Hour = "20:53";
+const ClockTime24hour = "08:53";

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

@@ -12,11 +12,12 @@ 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
-
+//ANSWER: Four function calls. Two function calls in line 4 & two function calls in line 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?
-
+//ANSWER: The comma in the replaceAll() function in Line 5 is missing. Put the comma back in to fix it.
 // c) Identify all the lines that are variable reassignment statements
-
+//ANSWER: Lines that are variable reassignment statements are Lines 4 & 5.
 // d) Identify all the lines that are variable declarations
-
+//ANSWER: Variable declarations line: 1,2,7,& 8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//ANSWER: The expression first removes the comma(,) in carPrice and then converts it to a number.

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

@@ -12,14 +12,15 @@ 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?
-
+//ANSWER: There were six variable declarations
 // b) How many function calls are there?
-
+//ANSWER: There were  no function calls except for the log() function
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
-
+//ANSWER: 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.
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+//ANSWER: Line 4 with find the remainder whenmovieLength is divided by 60 and assigns the remainder to remainingSeconds (24)
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+//ANSWER: The variable result represents the total lenth of the movie which shows the total hours, minutes and seconds remain in string format.
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//ANSWER: The code semed to  work for all values of movieLength.

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

@@ -25,3 +25,12 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. Lines 3 to 6: extracts "399" as a string and assigns the values to penceStringWithoutTrailingP.
+//    It uses the substring to extract from position 0 to 3.
+// 3. Line 8: padStart is used to pad the values in penceStringWithoutTrailingP with "0" from the start of the value to make up a length of 3.
+//    Since penceStringWithoutTrailingP already has "399" with a length of 3, no padding is done.
+// 4. Line 9 to 12: substring is used to extract from paddedPenceNumberString,  starting from position 0 to 1 giving 3 which is stored in the variable pounds.
+// 5. Line 14 to 16: substring is used to extract from paddedPenceNumberString, starting from position 1 to the end givin "99"
+//    "99" is padded with "0" from the end of the value to make a length of 2 but sincw "99" already has a length of 2, no padding is done.
+//    "99" is assigned to the variable pence.
+// 6. Line 18: uses console.log() to print the values of pounds and pence preceeded by "£" and separated by "." to give "£3.99"

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

@@ -11,8 +11,15 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+## Got "chrome://new-tab-page says" popup
+## 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?
+## Got "chrome://new-tab-page says" popup
+## Got "What is your name?"
+## Got a box for input
 What is the return value of `prompt`?
+## promt: ƒ prompt() { [native code] }
+## myName: Ayo

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

@@ -4,13 +4,19 @@ In this activity, we'll explore some additional concepts that you'll encounter i
 
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
-What output do you get?
+What output do you get? 
+## ƒ log() { [native code] }
 
 Now enter just `console` in the Console, what output do you get back?
-
+## console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
 Try also entering `typeof console`
-
+## 'object'
 Answer the following questions:
 
 What does `console` store?
+## Objects
+## console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+## console.log - Prints the text to the Console as a log message
+## console.assert() writes an error message to the console if the assertion is false
+## The dot(.) allows the access of the log method inside the console object