London | 26-ITP-Sep | Chandaramani Gaire | Sprint 2 | Sprint 2 Coursework

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

@@ -3,4 +3,5 @@ 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
+// Describe what line 3 is doing, in particular focus on what =  reassign a variable using the =  + operator.
+//Line 1 assigns count = 0. Line 3 uses that value (0) and adds 1, so count becomes 1.

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

@@ -1,10 +1,10 @@
 const firstName = "Creola";
 const middleName = "Katherine";
 const lastName = "Johnson";
-
+const CKJ = "something"
 // 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.
 
-const initials = ``;
-
-// https://www.google.com/search?q=get+first+character+of+string+mdn
+const 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-2/1-key-exercises/3-paths.js

@@ -17,7 +17,9 @@ 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 ext = base.slice(base.lastIndexOf("."));
 
-// https://www.google.com/search?q=slice+mdn
+// https://www.google.com/search?q=slice+mdn
+console.log(`The dir part of ${filePath} is ${dir}`);
+console.log(`The ext part of ${filePath} is ${ext}`);

Sprint-2/1-key-exercises/4-random.js

@@ -7,3 +7,10 @@ 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
+
+// In this exercise, num represent the value integer number between 1 to 100.
+//Math.random generates a random decimal number from 0 up to 1, but not including, 1.
+// down to the nearest whole number (integer).
+//Running the program several times generate the whole number(integer) like (1,10,15,44,66,55) several times between 1 to 100 all 100 number has a equal 1% chance to appear(generate).
+console . log (num)
+//

Sprint-2/2-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?
+for single line we used // and for multiple line use /*

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

@@ -2,3 +2,6 @@
 
 const age = 33;
 age = age + 1;
+
+/* In this case age is not const means variable is not reassigned so that,
+ we throws a TypeError: Assignment to constant variable.2

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

@@ -3,3 +3,6 @@
 
 console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+
+
+/*we need to put declare variables(const cityOfBirth = "Bolton";) in first line after using expression console.log.

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

@@ -1,9 +1,12 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = string(cardNumber).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
+//Card number is a number not a string so it will throw typeerror.
+// i did not think slice method can not run in number method so that i change it in string 

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

@@ -1,2 +1,3 @@
 const 12HourClockTime = "8:53pm";
 const 24hourClockTime = "20:53";
+/*variable is not start with number show syntaxerror.

Sprint-2/3-mandatory-interpret/1-percentage-change.js

@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",",""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -12,11 +12,24 @@ 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
-
-// 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?
-
-// c) Identify all the lines that are variable reassignment statements
-
-// 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?
+/* there has five function in line 4 and  and console . log also has one 
+line 4 and 5 has two Number() function
+line 4 and 5 has two replaceALL() function
+line 10 has one console . log ()
+
+/* 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?
+   In line five error shown in replaceAll("," "")); missing comma before last two comma(",","").
+
+/* c) Identify all the lines that are variable reassignment statements
+line 4 carPrice = Number(carPrice.replaceAll(",", ""));
+line 5 priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+As per the carPrice and priceAfterOneYear has been declared in line 1 and 2 by using let variable.
+
+/*d) Identify all the lines that are variable declarations
+line 1 let carPrice = "10,000";
+line 2 let priceAfterOneYear = "8,543";
+line 7 const priceDifference = carPrice - priceAfterOneYear;
+line 8 const percentageChange = (priceDifference / carPrice) * 100;
+
+/* e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+replaceALL throwout all the commas from the string and number became numerical value.

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

@@ -1,5 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
-
+const movieLength = 8784; 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
 
@@ -8,18 +7,28 @@ const totalHours = (totalMinutes - remainingMinutes) / 60;
 
 const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
 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?
+/* line 1 const movieLength  line 3 const remainingSeconds line 4 const totalMinutes
+   line 6 const remainingMinutes line 7 const totalHours  line 9 const result
 
 // b) How many function calls are there?
+/* there are one function 
+      console.log(result);
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+/*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?
+/* This expression convert movies time second into minutes dividend by 60 second.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+/* The variable represent the movieLength in second,minutes and hours. 
+    We can change this name as movieTime.
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+/* In this section we can only use the positive natural numbers  but if we put numbers that divide by 60 without a remainder get the exact time like 10, 20 50.

Sprint-2/3-mandatory-interpret/3-to-pounds.js

@@ -4,18 +4,23 @@ const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
-
+// remove the p from the "399p" and make "399"
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//padStart() add characters to the starting of the string and provide 3 long characters.
+//Because we have to convert pound and pence.
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
+// we take out the 2 character and store the remaining part of the string as the pound.
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
+  // At last we get the last two characters as the pence.
 
 console.log(`£${pounds}.${pence}`);
+//We can display the price of pound and pence like £3.99.
 
 // This program takes a string representing a price in pence
 // The program then builds up a string representing the price in pounds

Sprint-2/4-stretch-explore/chrome.md

@@ -8,8 +8,12 @@ Let's try an example.
 In the Chrome console, invoke the function `alert` with one argument, the string `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+Answer An alert popped up
 
 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?
+Answer A popup prompts me to write my name.
+
 What is the return value of `prompt`?
+Answer The value i entered in the text box.

Sprint-2/4-stretch-explore/objects.md

@@ -5,12 +5,19 @@ 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?
+Answer The output is ƒ log() { [native code] }
 
 Now enter just `console` in the Console, what output do you get back?
+Answer console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, ...} but i can't copy it.
+
 
 Try also entering `typeof console`
+Answer It shows object'
 
 Answer the following questions:
 
 What does `console` store?
+console is an object with properties that are function values. These functions are called methods because they belong to the console object.
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+console.log means "access the log method from the console object" and console.assert means "access the assert method from the console object.