West Midlands | Gabriel Deng | Module-Structuring-and-Testing-Data | Sprint-2

Sprint-1/errors/2.js

@@ -1,5 +1,9 @@
 // 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";
+console.log(`I was born in ${cityOfBirth}`);
+
+
+//This is a hosting error. You can't use a variable before declaring it. I have made some changes on how I believe it should be.

Sprint-1/errors/3.js

@@ -1,9 +1,17 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const cardNumberStrings = cardNumber.toString();
+const last4Digits = cardNumberStrings.slice(-4);
 
 // 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
+
+
+// I believe the the code is correct. However, the first variable is considered as a string. If operation were to be done on it, the output should first be converted into an integer.
+
+//I used toString method on the cardNumber to turn it into strings and then use slice to retrieve the last 4 digits.
+
+// I converted the cardNumber integers into a string and assigned them to a variable called cardNumberStrings, this way, I can continue using the 'const' declaration instead of using the 'let'

Sprint-1/errors/4.js

@@ -1,2 +1,6 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twenty4HourClockTime = "20:53";
+const twelveHourClockTime = "08:53";
+
+// This is a wrong declaration syntax, variables can't start with numbers, special characters or contain reserved words.
+
+//I neglect that fact the two variables have the same names since Javascript variable names are not 

Sprint-1/exercises/count.js

@@ -4,3 +4,5 @@ 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
+
+//Line 3 is about an assignment operator used to increase the count variable by 1.

Sprint-1/exercises/decimal.js

@@ -1,5 +1,9 @@
 const num = 56.5678;
 
+const wholeNumberPart = Math.floor(num);
+const decimalPart = (num % 1).toFixed(4);
+const roundedNum = Math.round(num);
+
 // You should look up Math functions for this exercise https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math
 
 // Create a variable called wholeNumberPart and assign to it an expression that evaluates to 56 ( the whole number part of num )

Sprint-1/exercises/initials.js

@@ -2,5 +2,7 @@ let firstName = "Creola";
 let middleName = "Katherine";
 let lastName = "Johnson";
 
+const initials = firstName[0] + middleName[0] + lastName[0]
+
 // 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.

Sprint-1/exercises/paths.js

@@ -16,3 +16,7 @@ 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(".") + 1);

Sprint-2/debug/0.js

@@ -1,7 +1,10 @@
 // Predict and explain first...
 
 function multiply(a, b) {
-  console.log(a * b);
+  return a * b;
+  // console.log(a * b);
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+
+// The function returns undefined but it will log the product of the inputs to the console tab. 

Sprint-2/debug/1.js

@@ -1,8 +1,9 @@
 // Predict and explain first...
 
 function sum(a, b) {
-  return;
-  a + b;
+  return a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+
+//The function returns undefined since the value has not been assigned to it.

Sprint-2/debug/2.js

@@ -3,7 +3,7 @@
 const num = 103;
 
 function getLastDigit() {
-  return num.toString().slice(-1);
+  return num.toString().slice(num.length - 1);
 }
 
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
@@ -12,3 +12,5 @@ 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
+
+//Using slice(-1) is not a feasible method to use in this case. The correct way to do the code is by using num.toString().slice(num.length - 1)

Sprint-2/errors/0.js

@@ -7,3 +7,8 @@ function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
+
+
+capitalise('hello world')
+
+// This function is intended to get the first character in a string entered.

Sprint-2/errors/1.js

@@ -4,10 +4,13 @@
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
+  // const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage(0.5));
+
+
+// The function won't work because variable name declared cannot be used since it is used as a parameter.

Sprint-2/errors/2.js

@@ -3,8 +3,9 @@
 
 // this function should square any number but instead we're going to get an error
 
-function square(3) {
+function square(num) {
     return num * num;
 }
 
 
+// This function will return a syntax error because a number is used instead of a parameter. The correct function declaration should have a parameter instead of a value.

Sprint-2/extend/format-time.js

@@ -22,3 +22,24 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+const currentOutput3 = formatAs12HourClock("16:00");
+const targetOutput3 = "4:00 pm";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+)
+
+const currentOutput4 = formatAs12HourClock("19:00");
+const targetOutput4 = "7:00 pm";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput4}, target output: ${targetOutput4}`
+)
+
+const currentOutput5 = formatAs12HourClock("20:00");
+const targetOutput5 = "8:00 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput5}, target output: ${targetOutput5}`
+)

Sprint-2/implement/bmi.js

@@ -13,3 +13,9 @@
 // Given someone's weight in kg and height in metres
 // Then when we call this function with the weight and height
 // It should return their Body Mass Index to 1 decimal place
+
+const findBMI = (weight, height) => {
+  return (weight / (height ** 2)).toFixed(1);
+}
+
+findBMI(70, 1.73);

Sprint-2/implement/cases.js

@@ -13,3 +13,13 @@
 
 // You will need to come up with an appropriate name for the function
 // Use the string documentation to help you find a solution
+
+const upperSnakeCase = (input) => {
+  for ( let i = 0; i < input.length; i++) {
+
+  }
+  const upperCase = input.replace(/\s+/g, '_').toUpperCase();
+  console.log(upperCase)
+}
+
+upperSnakeCase('lords of the rings');

Sprint-2/implement/to-pounds.js

@@ -4,3 +4,21 @@
 // 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 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");
+
+console.log(`£${pounds}.${pence}`);
+}
+
+toPounds('3455p');

Sprint-2/implement/vat.js

@@ -8,3 +8,9 @@
 // Given a number,
 // When I call this function with a number
 // it returns the new price with VAT added on
+
+const calcualteVat = (price) => {
+  return `£${price * 1.2}`;
+}
+
+calcualteVat(60);

Sprint-2/interpret/time-format.js

@@ -19,13 +19,18 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
+    // ~ pad function will also be called three 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?
+    // ~ The value assigned to num will be the argument value 61
 
 // c) What is the return value of pad is called for the first time?
+    // ~ The return value will be '01'
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
+    // ~ The return value is 1 because the seconds input will subtract the remainingSeconds which is 1 and then divide the resultant value by 60, so the answer will give 1.
 
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
+    // ~ The return value is '01' because it will be calculating the remaining seconds which is 1 and as such the pad method will add 0 to it.