London- ITP January | Shohreh Bayat | Structuring and testing data | Week 1

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 +1,4 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;

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

@@ -1,5 +1,5 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
-
-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 +1,14 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
+console.log (last4Digits)
+
 
 // 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
+
+
+// In order to get an answer, I need to use something like "console.log" to be able to print it.

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

@@ -1,2 +1,4 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const TwelveHourClockTime = "08:53";
+const TwentyfourHourClockTime = "20:53";
+console.log(TwelveHourClockTime);
+console.log(TwentyfourHourClockTime);

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

@@ -13,10 +13,24 @@ console.log(`The percentage change is ${percentageChange}`);
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
 
+//5 functions
+//Number(carPrice.replaceAll(",", ""));
+//replaceAll(",", "")
+// Number(priceAfterOneYear.replaceAll("," ""))
+//replaceAll("," "")
+//console.log(`The percentage change is ${percentageChange}`)
+
 // 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?
+//SyntaxError: missing ) after argument list. priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
 
 // c) Identify all the lines that are variable reassignment statements
+//2 times
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
 
 // d) Identify all the lines that are variable declarations
+//4 times. lines which has Let and const.
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// it removes the "," which is in between the 10,000 and make it "10000", same for "8543"
+//Number changes the type of strings to a numbers

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

@@ -12,14 +12,20 @@ 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?
+//6 variable declaration, all of the lines which starts with const.
 
-// b) How many function calls are there?
+// b) How many function calls are there? 
+//only one function call which is console.log.
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// % is a "Remainder operator"
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// It calculates according to minutes. Initially it takes movie length in seconds and reduces it from remaining seconds, then the answer will be divided to 60 which shows the length of the movie in minutes.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+//It shows the duration of the movie in HH:MM:SS. A better name could be "MovieDuration" or "MovieLength".
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//Yes, the code works for all length of movies from 0 and more. It converts any movie length to HH:MM:SS format.

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

@@ -25,3 +25,9 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+//2. removes P at the end of the 399P to show the numerical part of the string.
+//3.Pads the string to ensure it's at least 3 digits long
+//4. Extracts the pounds part (the first digit) from the string "3" from "399"
+//5.Extracts the pence part (last two digits) and ensures it's always 2 digits long.
+//6. Prints it in a format with symbols pounds and pence.
+