Manchester | 25-ITP-Sep | Mahtem T. Mengstu | Sprint 2 | coursework/sprint-2

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

@@ -1,13 +1,24 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> I guess we would'nt need to say let in line 8 because str is already decleared as an argument 
+// within the function capitalise(str).
+// 
 
 // 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;
+//}
+
+//capitalise("hello")
+// =============> A syntaxError occured as 'str' is already declared. 
+// =============> write your new code here
+
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+console.log(capitalise("hello"));

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

@@ -1,20 +1,36 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+
+// =============> I think, the function convertToPercentage is not called at line 16, and 
+// there is no any importance of declaring cons decimalNumber as it is already declared.
 
 // Try playing computer with the example to work out what is going on
 
+//function convertToPercentage(decimalNumber) {
+//  const decimalNumber = 0.5;
+//  const percentage = `${decimalNumber * 100}%`;
+
+//  return percentage;
+//}
+
+//console.log(decimalNumber);
+
+// =============> A syntaxError appeared indicating 'decimalNumber' has already been declared. 
+
+// Finally, correct the code to fix the problem
+// =============> write your new code here
+
+
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage(0.5));
+console.log(convertToPercentage(0.27));
+console.log(convertToPercentage(0.76));
 
-// =============> write your explanation here
-
-// Finally, correct the code to fix the problem
-// =============> write your new code here
+// The new code run smoothly and retuned "50%"
+// decimalNumber is now taken as a parameter. 

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

@@ -3,18 +3,23 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> The num should be inside the function square (num) not 3 and square function should be
+                 // called later as square(3)
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//    return num * num;
+//}
 
-// =============> write the error message here
+// =============> function suqare(3) SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> 3 was not expected... instead a declaration or paramater like num was expected.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+    return num * num;
+}
+console.log(square(3))
 

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

@@ -1,14 +1,22 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> In line 6 instead of console.log, I would expect retun a*b; the code will result in
+                // just printing a*b 
 
-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
+// =============> After running it returned 320 The result of multiplying 10 and 32 is undefined
+// Because the multiply parameters were not taken as paramaters within a retunr. 
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+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 +1,14 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> The semi colon ; after retunr will results in syntax error. 
 
 function sum(a, b) {
-  return;
-  a + b;
+  return a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> Unlike my expectation the code run without error as "The sum of 10 and 32 is undefined"
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+// we just need to delete the ;  after return and bring a+b side by side as retun a+b; 

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

@@ -1,24 +1,35 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> The code will first return 3 as string and after calling the function getLastDigit,
+                 // it will not return anything because every number pased will be changed to string. 
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
+// 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)}`);
+
+// Now run the code and compare the output to your prediction
+// =============> The last digit of 42 is 3 three times.. 
+// // =============> my prediction was somehow closer but not exact, the case is parameter num needs to be with the getLastDifit
+// function instead of const num = 103. 
+// Finally, correct the code to fix the problem
+// =============> write your new code here
+
+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)}`);
 
-// Now run the code and compare the output to your prediction
-// =============> write the output here
-// Explain why the output is the way it is
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
-// =============> write your new code here
-
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+
+//the case is parameter num needs to be with the getLastDigit function instead of const num = 103. 

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

@@ -15,5 +15,16 @@
 // 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
-}
+
+    const bmi = weight/(height*height);  
+    return Number(bmi.toFixed(1));
+
+    // return the BMI of someone based on  their weight and height
+}
+
+console.log("The BMI is",calculateBMI(70, 1.73));
+console.log(typeof calculateBMI(70,1.73));
+
+// As I see it in the console it looks like a number whilit was a string. 
+//  the code has been updated to return a number as -----return Number(bmi.toFixed(1)); 
+// changing the string into number. 

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

@@ -14,3 +14,19 @@
 // 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 capSnakeCase(str) {
+
+    const upper = str.toUpperCase();
+    const snake = upper.replace(/ /g, "_");
+
+    return snake;
+}
+
+console.log(capSnakeCase("lord of the rings"));
+
+// Step-1 ----> Get a string
+// Step-2 ----> change to upper case
+// Step-3 ----> Replace space with underscore
+// Step-4 ----> Return capSnakeCase

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

@@ -4,3 +4,20 @@
 // 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(penceString) {
+
+    const penceStringWithoutTrailingP = penceString.substring( 0,penceString.length - 1);
+    const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+    const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+    const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+
+    return `£${pounds}.${pence}`;
+}
+console.log(toPounds("399p"))
+console.log(toPounds("5p"))
+console.log(toPounds("5678p"))
+

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

@@ -11,24 +11,26 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+console.log(formatTimeDisplay(61))
+
 // 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
+// =============> Pad is called three (3) times. 
 
 // 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
+// =============> 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> "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
+// =============> 1: the leftover second is assigned to num as remainingSeconds 61%60
 
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> 01  the remainingSeconds from passed from pad to num is changed to string and padded as 01