London | 26-ITP-May | Dipa Sarker | Sprint 2 | Coursework

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

@@ -1,13 +1,22 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The variable inside the function str has already declared as function parameter.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
+//function capitalise(str) {
+  //let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  //return str;
+//}
 
 // =============> write your explanation here
+// Repeatative variable declaration prediction matches with the error message. Then I changed the old variable into new inside the 
+// function. Then affter running the code it won't return anything cause no function call has been made yet.
 // =============> write your new code here
+// This is my code:
+function capitalise(str) {
+  let newstr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return newstr;
+} 
+console.log(capitalise("dipa"));

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

@@ -2,19 +2,37 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+// I thought the function will work properly but couldn't print the correct value cause the value should be convertToPercentage 
+// but it is declared only as decimalNumber.
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+//function convertToPercentage(decimalNumber) {
+  //const decimalNumber = 0.5;
+  //const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+  //return percentage;
+//}
 
-console.log(decimalNumber);
+//console.log(decimalNumber);
 
 // =============> write your explanation here
+// When I run the code after my prediction it shows SyntaxError: Identifier 'decimalNumber' has already been declared. Which means
+// decimalNumber has been declared already as function parameter and then again declared inside the function as variable. Then when I 
+// declare const decimalNumber = 0.5; outside the function and run the code it shows the value of variable decimalNumber which is 0.5. Then
+// I replace console.log(decimalNumber); to console.log(convertToPercentage); and run the code again and it shows this output 
+// [Function: convertToPercentage] which means only the funtion name. Then I replace console.log(convertToPercentage); to
+// console.log(convertToPercentage(decimalNumber)); again and it finally works properly that means converted the decimal number to 
+// percentage value which shows 50% . 
+
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+// Corrected code:
+
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
+}
+const decimalNumber = 0.5;
+console.log(convertToPercentage(decimalNumber));

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

@@ -4,17 +4,28 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// I think we cannot directly insert value which is 3 as a parameter. We have to declare it as a variable. 
 
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+//  return num * num;
+//}
 
 // =============> write the error message here
+// The error message shows SyntaxError: Unexpected number
 
 // =============> explain this error message here
+// The error shows SyntaxError as Unexpected number which means the function syntax doesnot expect to input
+// any values directly in the parameter. That's why the function doesnot work. 
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+// The correct code: 
+
+function square(num) {
+    return num * num;
+}
+let num = 3;
+console.log(square(num));
 
 

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,24 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// I think there is nor function call has been made. a and b only inserted as function parameters.
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// function multiply(a, b) {
+//  console.log(a * b);
+// }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+// The result of multiplying 10 and 32 is undefined. This is the error. Now I think the reason for showing the result undefined is that 
+// console.log(a * b); only prints 320 but the function does not return anything. 
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+// The correct code:
+
+function multiply(a, b) {
+  return(a * b);
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

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

@@ -1,13 +1,23 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// I think only return; doesnot mean anything means it won't return anything. Besides, the expression a + b; won't also work
+// cause after calculating a + b it won't return anything and the output will show undefined value.
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+// function sum(a, b) {
+//  return;
+//  a + b;
+// }
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// My prediction exactly matches with the output after I run code.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+// The correct code:
+
+function sum(a, b) {
+  return (a + b);
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

Sprint-2/2-mandatory-debug/2.js

@@ -2,23 +2,42 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// i think the function won't return anything for numbers 42, 105 and 806 because the variable num contains value 103 and the return will only
+// work with 103 inside the function. There is no relation between const num = 103; and 42, 105 and 806. 
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// function getLastDigit() {
+// return num.toString().slice(-1);
+// }
 
-console.log(`The last digit of 42 is ${getLastDigit(42)}`);
-console.log(`The last digit of 105 is ${getLastDigit(105)}`);
-console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+// console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+// console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+// console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+// The output: 
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+// The output is quite similar to my prediction. When the function tried to find out function calls for getLastDigit(42), getLastDigit(105)
+// and getLastDigit(806) it doesn't find any of these because those didn't match with the variable declaration. As the function wokred only
+// with 103, it returned value for 103 and printed 3 as last digit for all three values. 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+// The correct code:
+
+function getLastDigit(num) {
+  return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem

Sprint-2/3-mandatory-implement/1-bmi.js

@@ -14,6 +14,10 @@
 // Then when we call this function with the weight and height
 // It should return their Body Mass Index to 1 decimal place
 
-function calculateBMI(weight, height) {
-    // return the BMI of someone based off their weight and height
-}
+
+function calculateBMI(weightkg, heightm) {
+  const BMI = (weightkg / (heightm * heightm));  
+  return BMI.toFixed(1);
+}
+let result = calculateBMI(70, 1.73);
+console.log (result);

Sprint-2/3-mandatory-implement/2-cases.js

@@ -14,3 +14,9 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+
+function toUpperSnakeCase(str) {
+    let newstr = str.replaceAll(" ", "_").toUpperCase();
+    return newstr;
+}
+console.log(toUpperSnakeCase("lord of the rings"));

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

@@ -4,3 +4,14 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+
+
+function toPounds(pence) {
+ const remainingPence = (pence % 100);
+ const Pounds = (pence - remainingPence) / 100;
+ return `£${Pounds}.${remainingPence}`;
+} 
+
+console.log (toPounds(155));
+console.log (toPounds(99));
+console.log (toPounds(10000));

Sprint-2/4-mandatory-interpret/time-format.js

@@ -15,24 +15,29 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+const seconds = 61;
+console.log(formatTimeDisplay(seconds));
 // You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
 
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// For each formatTimeDisplay is called, pad will be called 3 times. 1. pad(totalHours), 2. pad(remainingMinutes), 3. pad(remainingSeconds).
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
+// The value assigned to num when pad is called for the first time will be 0.
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// The return value of pad when it is called for the first time will be "00". 
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// The value assigned to num when pad is called for the last time in this program will be 1. Because, pad is called for the last time 
+// for the value of remainingSeconds.
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// The return value of pad when it is called for the last time in this program will be "01". Because, after converting num.toString(1)
+// the length of the string "1" is 1 character. So it checks in while (numString.length < 2) and founds "1" which is less than 
+// 2 character length. Then it will go inside numString = "0" + numString; and executes the function and will return "01".

Sprint-2/5-stretch-extend/format-time.js

@@ -4,22 +4,79 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  const minutes = time.slice(3);
+
+   if (hours === 0) {
+    return `12:${time.slice(3)} am`;
+   }
+  else if (hours < 12) {
+   return `${time} am`;
+  }
+  else if (hours <= 12) {
+   return `${time} pm`;
+  }
+  else if (hours > 12) {
+    return `${String(hours - 12).padStart(2, "0")}:${minutes} pm`;
   }
-  return `${time} am`;
+  else if (hours > 12) {
+    return `${hours - 12}:${minutes} pm`;
+  }
+  else if (hours < 12) {
+   return `${time}:${minutes} am`;
+}
 }
-
 const currentOutput = formatAs12HourClock("08:00");
 const targetOutput = "08:00 am";
 console.assert(
   currentOutput === targetOutput,
   `current output: ${currentOutput}, target output: ${targetOutput}`
 );
+console.log (formatAs12HourClock("08:00"));
 
 const currentOutput2 = formatAs12HourClock("23:00");
 const targetOutput2 = "11:00 pm";
 console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+console.log (formatAs12HourClock("23:00"));
+
+const currentOutput3 = formatAs12HourClock("00:00");
+const targetOutput3 = "12:00 am";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+console.log (formatAs12HourClock("00:00"));
+
+const currentOutput4 = formatAs12HourClock("23:59");
+const targetOutput4 = "11:59 pm";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`
+);
+console.log (formatAs12HourClock("23:59"));
+
+const currentOutput5 = formatAs12HourClock("12:00");
+const targetOutput5 = "12:00 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`
+);
+console.log (formatAs12HourClock("12:00"));
+
+const currentOutput6 = formatAs12HourClock("13:00");
+const targetOutput6 = "01:00 pm";
+console.assert(
+  currentOutput6 === targetOutput6,
+  `current output: ${currentOutput6}, target output: ${targetOutput6}`
+);
+console.log (formatAs12HourClock("13:00"));
+
+const currentOutput7 = formatAs12HourClock("11:59");
+const targetOutput7 = "11:59 am";
+console.assert(
+  currentOutput7 === targetOutput7,
+  `current output: ${currentOutput7}, target output: ${targetOutput7}`
+);
+console.log (formatAs12HourClock("11:59"));