LONDON_JAN25 | KHALIL ALI | STRUCTURING_AND_TESTING_DATA | SPRINT 2 | WEEK 5

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> str was declared twice, once as a parameter and once as a variable.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +9,13 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
+
+
+// =============> SyntaxError: Identifier 'str' has already been declared
+// =============> this error because the variable str was declared twice.
 // =============> write your new code here
+function capitalise(str) {
+  return str =`${str[0].toUpperCase()}${str.slice(1)}`;
+}
+
+console.log(capitalise('hi there'));

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

@@ -1,20 +1,29 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> decimalNumber is declared twice, once as a parameter and once as a variable.
+// =============> console.log(decimalNumber); should be console.log(convertToPercentage(0.5));
 
 // 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
+// =============> SyntaxError: Identifier 'decimalNumber' has already been declared
+// =============> this error because the variable decimalNumber was declared twice.
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+const decimalNumber = 0.5;
+console.log(convertToPercentage(decimalNumber));

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

@@ -3,18 +3,22 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> right function declare should have a variable parameter instead of number
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
+// =============> write the error message here SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> explain this error message here a number instead of a variable was declared as a parameter
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+    return num * num;
+}
+let num = 3;
+console.log(square(num))

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

@@ -1,14 +1,22 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here the function multiply does not return a value, so the console.log will print undefined.
 
-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 output is:
+// 320
+// The result of multiplying 10 and 32 is undefined
+// there is no return in multiply function so it will return undefined
 // 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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here there is no thing after return in the function sum so it will return undefined.
 
 function sum(a, b) {
   return;
@@ -9,5 +9,14 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// the output is:
+// The sum of 10 and 32 is undefined
+// there is no return in sum function so it will return undefined
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+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

@@ -1,24 +1,38 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here the function getLastDigit does not have a parameter
 
-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 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
+// because the function getLastDigit does not have a parameter,
+// so every time returns the last digit of the num(103).
 // =============> 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
+const num = 103;
+
+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)}`);

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

@@ -16,4 +16,7 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
+let BMI = (weight/(height*height)).toFixed(1);
+return Number(BMI);
+}
+console.log(`my BMI is ${calculateBMI(100, 1.78)}`); 

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

@@ -14,3 +14,7 @@
 // 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 snakeCase (str){
+return str.toUpperCase().replace(/ /g, `_`);
+}
+console.log(snakeCase("my name is khalil ali"));

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

@@ -4,3 +4,33 @@
 // 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
+const penceString = "399p";
+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("100p"))
+console.log(toPounds("1000p"))
+// This program takes a string representing a price in pence
+// The program then builds up a string representing the price in pounds
+
+// You need to do a step-by-step breakdown of each line in this program
+// Try and describe the purpose / rationale behind each step
+
+// To begin, we can start with
+// 1. const penceString = "399p": initialises a string variable with the value "399p"

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

@@ -17,18 +17,18 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> write your answer here 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
+// =============> write your answer here 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> 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
+// =============> write your answer here 1 because the remaining seconds is 1
 
 // 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
+// =============> write your answer here "01" because the pad function adds zero to the start of the number

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

@@ -4,6 +4,12 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  if(hours===0){
+    return `12:00 am`
+  }
+  if(hours===12){
+    return `12:00 pm`
+  }
   if (hours > 12) {
     return `${hours - 12}:00 pm`;
   }
@@ -23,3 +29,7 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+console.log(formatAs12HourClock("00:00"))
+console.log(formatAs12HourClock("06:00"))
+console.log(formatAs12HourClock("12:00"))
+console.log(formatAs12HourClock("23:00"))