sprint-1 completed

Author: MehrozMunir

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

@@ -3,7 +3,7 @@ let count = 0;
 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 count variable and then saving this new value to count variable
+// Describe what line 3 is doing, in particular focus on what = is doing
+// Line 3 is adding 1 to count variable and then saving this new value to count variable
 // = sign is being used to assign the new value of count to the count variable

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

@@ -10,12 +10,12 @@ console.log(num);
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
 
 //num in the above code represents integer numbers from 1 to 100
-// Math.random() method used in the above code returns floating numbers between 0(inclusive) and 1(exclusive)
+// random() method in Math class is used in the above code returns floating numbers between 0(inclusive) and 1(exclusive)
 /*and (maximum - minimum + 1) will give use the number that when multiplied by values between 
 0(inclusive) and 1(exclusive) we will get results from 0 to 99.99999999..... including any decimal values in between
 and the Math.floor is used to get rid of the decimal values and return only numbers; so our
-values will become 0 to 99 only numbers
-and at the end part of the equation we are adding minimum value i.e. 1 which will result in
+values will become 0 to 99 only numbers.
+And at the end part of the equation we are adding minimum value i.e. 1 which will result in
 assigning values from 1 to 100 in num; that's why we are getting only values from 1 to 100 in our num
 and every time we print the num in console.log() we can get any values between 1 to 100 depending on the radom value returned 
 by the Math.random() method.*/

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

@@ -1,7 +1,10 @@
 // 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}`);
+//const cityOfBirth = "Bolton";
 
 //the above code is not working because you are printing or using the cityOfBirth constant before initializing it
+// it can be solved by declaring and initializing the constant before using it as shown below:
+const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -43,4 +43,4 @@ const percentageChange = (priceDifference / carPrice) * 100; */
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
 /* This code is replacing all the comma characters with an empty character inside the carPrice String and then converting that String  to a Number
 The purpose of doing this is because in the later part of code we are doing some Math calculations on this number 
-and, therefore, we can't use String, we need to remove the commas in the String and convert that String into a number
+and, therefore, we can't use String, we need to remove the commas in the String and convert that String into a number*/

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

@@ -12,14 +12,24 @@ 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?
+// Ans: 6
 
 // b) How many function calls are there?
+// Ans: 1
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
+/* Ans: In this expression the operator % is used which will return the remainder when we divide movieLength by 60
+        Specifically, in the above code it is used to get the remaining seconds which will be left over after
+        converting the movieLength i.e given in seconds into minutes. */
+
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+/* Ans: Here, we are taking out all the remainder or left over seconds from the movieLength seconds
+        and then dividing that value by 60 to get the length of movie in minutes. */
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+/* Ans: result represents the total length of movie in hours, minutes and seconds. The better name 
+        could be "lengthOfMovieInHMS" */
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Ans: Yes, this code will work with all number values of movieLength

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

@@ -1,20 +1,47 @@
+//initialises a string variable with the value "399p"
 const penceString = "399p";
 
+//creates a substring of penceString to remove the trailing or the last character p value and
+//assign the new value to "penceStringWithoutTrailingP"
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
-);
+);  //it will save 399 in penceStringWithoutTrailingP
+
+/* The method padStart is used when we want our string to have at least some length; 
+ in this case if the length of our string is less than 3, we are going to put "0"
+ in extra spaces
+ The reason for padding the pence number string to 3 size is because in the next step
+ we will create a substring by removing the last two values 
+ and that will give us the pounds number value and the remaining characters will be the
+ pence value. */
+const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); //it will not change our string because 399 already has three characters
 
-const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+/* Here we are trying to get the pounds value out of the total pence value 
+   Therefore we are creating a substring of paddedPenceNumberString to 
+   create a string that removes the last two numbers from paddedPenceNumberString
+   which are pence numbers. */
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
 
+
+/* Here, we are doing two things:
+   1. we are creating a substring of paddedPenceNumberString
+   to get the pence numbers only by returning the last two numbers.
+   2. We are using padEnd method to pad our result to two character values
+      and adding 0 at the end if the length of our substring is less than 2
+      
+   Note: However, our paddedPenceNumberString length is always going to be at least 3
+      and the below substring is going to return us the last two characters which is pence value
+      So, I don't understand the use padEnd and in fact, I tried commenting it and tested the code
+      with different penceString values and the results are same.  */
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
-
+  
+// in the below code we are printing the value starting with £ symbol of pounds and pence separated by "."   
 console.log(`£${pounds}.${pence}`);
 
 // This program takes a string representing a price in pence

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

@@ -11,8 +11,12 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+Ans: It creates an alert message on my tab with the text "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?
+Ans: It creates a message box on my tab with the input `"What is your name?"` and there is an input field beneath it for answering this question.
+
 What is the return value of `prompt`?
+Mehroz

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

@@ -5,12 +5,102 @@ 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?
+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, …}
+assert
+: 
+ƒ assert()
+clear
+: 
+ƒ clear()
+context
+: 
+ƒ context()
+count
+: 
+ƒ count()
+countReset
+: 
+ƒ countReset()
+createTask
+: 
+ƒ createTask()
+debug
+: 
+ƒ debug()
+dir
+: 
+ƒ dir()
+dirxml
+: 
+ƒ dirxml()
+error
+: 
+ƒ error()
+group
+: 
+ƒ group()
+groupCollapsed
+: 
+ƒ groupCollapsed()
+groupEnd
+: 
+ƒ groupEnd()
+info
+: 
+ƒ info()
+log
+: 
+ƒ log()
+memory
+: 
+MemoryInfo {totalJSHeapSize: 11200000, usedJSHeapSize: 10000000, jsHeapSizeLimit: 3760000000}
+profile
+: 
+ƒ profile()
+profileEnd
+: 
+ƒ profileEnd()
+table
+: 
+ƒ table()
+time
+: 
+ƒ time()
+timeEnd
+: 
+ƒ timeEnd()
+timeLog
+: 
+ƒ timeLog()
+timeStamp
+: 
+ƒ timeStamp()
+trace
+: 
+ƒ trace()
+warn
+: 
+ƒ warn()
+Symbol(Symbol.toStringTag)
+: 
+"console"
+[[Prototype]]
+: 
+Object
+
 
 Try also entering `typeof console`
+It is object
 
 Answer the following questions:
 
 What does `console` store?
+console is an object that does not store anything but it is used to call debugging
+methods such as log or assert or trace
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+it means that the console object is calling its methods log or assert using the dot "." operator
+