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

Author: gaireprakash20-ops

1-key-exercises/2-initials.js

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+const firstName = "Creola";
+const middleName = "Katherine";
+const 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.
+
+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

1-key-exercises/3-paths.js

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+// The diagram below shows the different names for parts of a file path on a Unix operating system
+
+// ┌─────────────────────┬────────────┐
+// │          dir        │    base    │
+// ├──────┬              ├──────┬─────┤
+// │ root │              │ name │ ext │
+// "  /    home/user/dir / file  .txt "
+// └──────┴──────────────┴──────┴─────┘
+
+// (All spaces in the "" line should be ignored. They are purely for formatting.)
+
+const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
+const lastSlashIndex = filePath.lastIndexOf("/");
+const base = filePath.slice(lastSlashIndex + 1);
+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 = filePath.slice(0, lastSlashIndex);
+const ext = base.slice(base.lastIndexOf("."));
+
+// 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}`);

1-key-exercises/4-random.js

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+const minimum = 1;
+const maximum = 100;
+
+const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
+
+// In this exercise, you will need to work out what num represents?
+// 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).
+// i think Changes the whole range to be greater by the minimum value
+//Ensures the value never comes less than 1.
+//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)
+//

2-mandatory-errors/0.js

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+/*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 */

2-mandatory-errors/1.js

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+// trying to create an age variable and then reassign the value by 1
+
+let age = 33;
+age = age + 1;
+
+console.log(age);
+
+/* In this case age is not const means variable is not reassigned so that,
+/*we throws a TypeError: Assignment to constant variable*/  
+ //I try  by let where console.log(age) shows Running] node "c:\Users\Desktop\code your future\Module-Onboarding\Module-JavaScript-Fundamentals\Sprint-2\Sprint-2\2-mandatory-errors\1.js"
+//34.

2-mandatory-errors/2.js

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+// 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";
+
+
+/*we need to put declare variables(const cityOfBirth = "Bolton";) in first line after using expression console.log.

2-mandatory-errors/3.js

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+const cardNumber = 4533787178994213;
+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
+// when i put capital letter ReferenceError: string is not defined so that nothing last4Digits not showed
+//in the terminal String is the function but string is the normal text.

2-mandatory-errors/4.js

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

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

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+let carPrice = "10,000";
+let priceAfterOneYear = "8,543";
+
+carPrice = Number(carPrice.replaceAll(",", ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",",""));
+
+const priceDifference = carPrice - priceAfterOneYear;
+const percentageChange = (priceDifference / carPrice) * 100;
+
+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
+/* 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.

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

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+const movieLength = 8784; 
+const remainingSeconds = movieLength % 60;
+const totalMinutes = (movieLength - remainingSeconds) / 60;
+
+const remainingMinutes = totalMinutes % 60;
+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.