LONDON | May-2025 | Anuar Duisenbek | Module-Structuring-and-Testing-Data | Sprint-2

.gitignore

@@ -1,4 +1,5 @@
 node_modules
+.idea/
 .DS_Store
 .vscode
 **/.DS_Store

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

@@ -1,13 +1,29 @@
 // Predict and explain first...
 //  =============> write your prediction here
+//
+// I predict we will make mistake because str has been already declared in body of function
 
 // call the function capitalise with a string input
+
+//Uncaught SyntaxError: Identifier 'str' has already been declared
+
 // interpret the error message and figure out why an error is occurring
 
+//'str' has already been declared.Also we call function,defind it,but we don't use it.
+
 function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
 
 // =============> write your explanation here
+
+//So I change : I just return str directly  ,add a function call and console.log():
+
 // =============> write your new code here
+
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}
+
+console.log(capitalise("Anuar"));

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

@@ -3,6 +3,10 @@
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
+/*SyntaxError: Identifier 'decimalNumber' has already been declared*/
+//Because same name is used again with const decimalNumber = 0.5;
+// inside the function.
+
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
@@ -16,5 +20,16 @@ console.log(decimalNumber);
 
 // =============> write your explanation here
 
+// console.log(decimalNumber); line is outside the function,
+//  so the variable decimalNumber is not defined in that scope.
+//  This will cause a ReferenceError.
+
 // 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(500));

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

@@ -1,6 +1,6 @@
 
 // Predict and explain first BEFORE you run any code...
-
+//We need to call function to use it, here will be an error!
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
@@ -10,11 +10,18 @@ function square(3) {
 }
 
 // =============> write the error message here
+//Uncaught SyntaxError: Unexpected number
 
 // =============> explain this error message here
 
+/*We get a syntax error because `3` is a number,
+ and function parameters must be valid variable names(x, num etc)*/
+
 // 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

@@ -1,6 +1,7 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// -So,I guess the code won't work, because we print the result of multiplication twice
 
 function multiply(a, b) {
   console.log(a * b);
@@ -9,6 +10,15 @@ function multiply(a, b) {
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+//-We need to remove console log in function and use instead of it return
 
 // 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

@@ -1,6 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+//I believe code won't work because return's value isn't assigned
 function sum(a, b) {
   return;
   a + b;
@@ -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 function returns undefined because return is followed by a line break.
+ JavaScript ends the return statement immediately, so the line a + b; is never executed. 
+To fix this, the expression must be placed on the same line as return.
+*/
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function sum(a, b) {
+  return a + b;
+}

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

@@ -1,8 +1,9 @@
 // Predict and explain first...
-
 // Predict the output of the following code:
 // =============> Write your prediction here
 
+//-I think here is error in function ,in getLastDigit(.......)  should be num in parentheses
+
 const num = 103;
 
 function getLastDigit() {
@@ -15,10 +16,36 @@ 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
+/*
+So, I was almost right ,
+the num is stick to this number "103", and actually it it should be in parenthesis.
+*/
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+/*
+// =============> write your explanation here
+The function `getLastDigit()` does not accept any parameters,
+ and always returns the last digit of the constant `num = 103`. 
+It completely ignores the numbers passed in (42, 105, 806) because it's not using them. 
+That's why the result is always the same — "3".
+
+ The last digit of 42 is 3
+VM757:8 The last digit of 105 is 3
+VM757:9 The last digit of 806 is 3
+*/
+
 // 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

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

@@ -15,5 +15,14 @@
 // 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
-}
+  let bmi = weight / (height * height);
+  if (bmi <= 18.5) {
+    return "Underweight";
+  } else if (bmi <= 25.0) {
+    return "Normal";
+  } else if (bmi <= 30.0) {
+    return "Overweight";
+  } else {
+    return "Obese";
+  }
+}

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

@@ -14,3 +14,8 @@
 // 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 makeAllCaps(text) {
+  return text.toUpperCase().split(" ").join("_");
+}
+console.log(makeAllCaps("Anuar"));

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

@@ -4,3 +4,22 @@
 // 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(amount) {
+  const penceStringWithoutTrailingP = amount.substring(0, amount.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("500p");
+toPounds("300p");
+toPounds("1000p");

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

@@ -19,16 +19,26 @@ function formatTimeDisplay(seconds) {
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
 
+//3 times — once for hours, once for minutes, 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?
+// b) What is the value assigned to num when pad is called for  the first time?
 // =============> write your answer here
 
+// 0 'totalHours';
+
 // 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 — this is the value of remainingSeconds, because 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
+
+// "01" — because 1 is converted to "1", and padStart adds one leading 0 → "01".

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

@@ -1,11 +1,21 @@
 // This is the latest solution to the problem from the prep.
 // Make sure to do the prep before you do the coursework
-// Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
+// Your task is to write tests for as many different groups of input data or edge cases as you can,
+// and fix any bugs you find.
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+
+  if (hours === 12) {
+    return `12:${minutes} pm`;
+  }
+
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    const newHours = String(hours - 12).padStart(2, "0");
+    return `${newHours}:${minutes} pm`;
   }
   return `${time} am`;
 }