complete 1-count exercise

Author: khalidbih

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

@@ -1,13 +1,22 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// It will give an error because the variable `str`, is declared twice inside the same function,
+// It is already a parameter, and then it is redeclared using `let`.
 
 // 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
+// The error happens because 'str' is written two times, first, it is the function parameter.
+// Then, it is declared again using 'let', javaScript does not allow declaring the same variable twice, inside the same function.
 // =============> write your new code here
+
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}
+console.log(capitalise("Code"));

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

@@ -1,20 +1,27 @@
 // Predict and explain first...
+// The code will give an error because `decimalNumber` is declared twice, 
+// once as the function parameter, and again with `const` inside the function.
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+// The error occurs because `decimalNumber` has already been declared.
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
-
-  return percentage;
-}
+// function convertToPercentage(decimalNumber) {
+// const decimalNumber = 0.5;
+// const percentage = `${decimalNumber * 100}%`;
 
-console.log(decimalNumber);
+// return percentage;
+// }
+// console.log(decimalNumber);
 
 // =============> write your explanation here
-
+// When I run the code, it gives a SyntaxError saying that, `decimalNumber` has already been declared.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber){
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage
+}
+console.log(convertToPercentage(0.5));

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

@@ -1,20 +1,29 @@
 
 // Predict and explain first BEFORE you run any code...
+// Function parameters must be variables, not numbers.
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// The code will give a SyntaxError because `3` is not a valid parameter name.
 
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+   // return num * num;
+// }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
-
+// The error happens because `3` is used as a parameter name.
+// Parameters must be variable names, not numbers.
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(number) {
+    return number * number;
+}
+console.log(square(3));
+
 

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

@@ -1,14 +1,22 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// When multiply(10, 32) runs, it prints 320, But the function does not return anything.
 
-function multiply(a, b) {
-  console.log(a * b);
-}
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// function multiply(a, b) {
+// console.log(a * b);
+// }
+
+// console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+// multiply prints the result but does not return anything, so using it in a template string shows undefined.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  return (a * b)
+}
+
+console.log(multiply(10, 32));

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

@@ -1,13 +1,21 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The function sum does not return anything, 
+// so the console will show "The sum of 10 and 32 is undefined".
 
-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
 // 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

@@ -2,23 +2,43 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// The output will always be 3.This is because the function uses the variable `num`,
+// which is set to 103.
+// 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
 // =============> write your explanation here
+
+// The output is always 3 because the function uses `num` (103),and ignores the number passed into it.
 // 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)}`);
+
+
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+// We must pass the number into the function as a parameter.

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

@@ -15,5 +15,10 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
+    const bmi = weight / (height * height);
+    const roundedBMI = Math.round(bmi * 10) / 10;
+    return roundedBMI;
+
+}
+console.log(calculateBMI(70, 1.73)); 
     // return the BMI of someone based off their weight and height
-}

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

@@ -14,3 +14,12 @@
 // 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(inputString) {
+   return inputString.replaceAll(" ", "_").toUpperCase();
+
+  
+}
+console.log(toUpperSnakeCase("hello there"));
+console.log (toUpperSnakeCase("lord of the rings"));

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

@@ -4,3 +4,29 @@
 // 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("400p"));
+console.log(toPounds("243p"));
+console.log(toPounds("9876p"));
+console.log(toPounds("18p"));

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

@@ -18,17 +18,22 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// It is called 3 times, once for hours, once for minutes, and once for seconds.
 
 // 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 first argument passed to pad is totalHours, which is 0.
 
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
+// The first call to pad returns "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 last call to pad receives num = 1, because remainingSeconds = 61 % 60 = 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
+// The last call to pad returns "01". The number 1 is converted to a string and padded to two characters with a leading 0.