Sheffield | 25-ITP-Sep | Xiayidan Abuxuukuer | Sprint 2 | Coursework #781

cjyuan · 2025-10-23T11:04:08Z

What type of value do you expect the function to return? A number or a string?
Does your function return the type of value you expect?

-Original file line number
+Diff line change
@@ Expand Up / @@ -11,3 +11,20 @@ function capitalise(str) { @@
     // =============> write your explanation here
     // =============> write your new code here
+    ///The error is :
+    let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+    //str is already a parameter of the function.
+    //Doing let str = ... is like giving it a new name in the same place, which JavaScript does not allow.
+    //we can just use the existing str instead of declaring it again.
+    function capitalise(str) {
+      // make the first letter uppercase
+      str = str[0].toUpperCase() + str.slice(1);
+      return str;
+    }

-Original file line number
+Diff line change
@@ Expand Up / @@ -9,12 +9,34 @@ function convertToPercentage(decimalNumber) { @@
       const decimalNumber = 0.5;
       const percentage = `${decimalNumber * 100}%`;
-      return percentage;
+      return percentage;=
     }
     console.log(decimalNumber);
     // =============> write your explanation here
+    Answer:
+    The number (0.5) goes into the function — that’s our decimalNumber.
+    We use that decimalNumber to make a percent.
+    We don’t write const decimalNumber again because we already have it.
+    We return the answer (like "50%").
+    Then we call the function with 0.5 and print what it gives back.
     // Finally, correct the code to fix the problem
     // =============> write your new code here
+    function convertToPercentage(decimalNumber) {
+      const percentage = `${decimalNumber * 100}%`;
+      return percentage;
+    }
+    console.log(convertToPercentage(0.5));

-Original file line number
+Diff line change
@@ Expand Up / @@ -6,15 +6,33 @@ @@
     // =============> write your prediction of the error here
     function square(3) {
         return num * num;
     }
     // =============> write the error message here
+    SyntaxError: Unexpected number
     // =============> explain this error message here
+    the function takes the number we give it (3) and times it by itself.
+    so 3 * 3 = 9.
+    it works now cuz we used num instead of a number in the ()
     // Finally, correct the code to fix the problem
     // =============> write your new code here
+    function square(num){
+        return num * num
+      }
+      console.log(square(3))

-Original file line number
+Diff line change
@@ Expand Up @@
     // =============> write your explanation here
+    the function just prints the answer, it dont return it.
+    so when we try to use it inside the message it shows 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)}`)

-Original file line number
+Diff line change
@@ Expand Up / @@ -9,5 +9,18 @@ function sum(a, b) { @@
     console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
     // =============> write your explanation here
+    the code dont work cuz the return stops the code before it adds the numbers.
+    so js never does a + b, that’s why it show 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)}`)

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Sheffield | 25-ITP-Sep | Xiayidan Abuxuukuer | Sprint 2 | Coursework #781

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cjyuan Oct 23, 2025

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-Original file line number
+Diff line change
@@ -1,11 +1,19 @@
     // Predict and explain first...
+    it will print 3 for all of them
     // Predict the output of the following code:
+    The last digit of 42 is 3
+    The last digit of 105 is 3
+    The last digit of 806 is 3
     // =============> Write your prediction here
     const num = 103;
     function getLastDigit() {
       return num.toString().slice(-1);
     }
@@ Expand All @@
     // Now run the code and compare the output to your prediction
     // =============> write the output here
+    The last digit of 42 is 2
+    The last digit of 105 is 5
+    The last digit of 806 is 6
     // Explain why the output is the way it is
     // =============> write your explanation here
+    It always shows 3 cuz the function just uses the num at the top (103).
+    It ignores the numbers we put in () like 42, 105, 806.
+    We need to let the function take a number as input.
     // Finally, correct the code to fix the problem
+    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)})
     // =============> write your new code here
     // This program should tell the user the last digit of each number.
@@ Expand Down @@

-Original file line number
+Diff line change
@@ Expand Up / @@ -14,6 +14,18 @@ @@
     // Then when we call this function with the weight and height
     // It should return their Body Mass Index to 1 decimal place
-    function calculateBMI(weight, height) {
+    function calculateBmi(weight,height) {
         // return the BMI of someone based off their weight and height
-    }
+    }
+    function calculateBMI (weight,height) {
+        const bmi = weight / (height*height)
+        return Math.round(bmi * 10) / 10;
+      }
+      console.log(calculateBMI(70,1.73))

-Original file line number
+Diff line change
@@ Expand Up / @@ -14,3 +14,18 @@ @@
     // 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 that turns text into UPPER_SNAKE_CASE
+    function makeUpperSnake(text) {
+        let newText =text.replace(/ /g,'_');
+        newText = newText.toUpperCase();
+        return newText;
+      }
+      console.log(makeUpperSnake("hello there"));
+      console.log(makeUpperSnake("lord of the rings"));

-Original file line number
+Diff line change
@@ Expand Up / @@ -4,3 +4,28 @@ @@
     // 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) {
+        let numberStr =penceString.substring(0,penceString.length -1);
+        numberStr = numberStr.padStart(3,"0");
+        let pounds = numberStr.substring(0, numberStr.length -2);
+        let pence = numberStr.substring(numberStr.length -2).padEnd(2,"0");
+        return "£" +pounds + "." +pence;
+      }
+    console.log(toPounds("399p"));
+    console.log(toPounds("50p"));
+    console.log(toPounds("5p"));
+    console.log(toPounds("1200p"));

-Original file line number
+Diff line change
@@ Expand Up / @@ -19,16 +19,73 @@ function formatTimeDisplay(seconds) { @@
     // a) When formatTimeDisplay is called how many times will pad be called?
     // =============> write your answer here
-    // Call formatTimeDisplay with an input of 61, now answer the following:
+    Answer:  3
+    return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
+    pad is called three times: for totalHours, remainingMinutes, and remainingSeconds.
+    So no matter what input we give to formatTimeDisplay, pad will always be called 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
+    Answer;
+    The first call is pad(totalHours).
+    const totalHours = (totalMinutes - remainingMinutes) / 60;
+    The value assigned to num when pad is called for the first time is 0.
+    Consequently, pad(0) will return '00', which ensures that the hour is formatted correctly in the final output string
     // c) What is the return value of pad is called for the first time?
     // =============> write your answer here
+    Answer; 1
+    return num.toString().padStart(2, "0");
+    num = 1
+    num.toString() = "1"
+    "1".padStart(2, "0") = "01"
+    If you call pad(0), the return value will be '00'.
+    If you call pad(1), the return value will be '01'.
+    If you call pad(5), the return value will be '05'.
+    If you call pad(10), the return value will be '10'
     // 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
+    Answer; 1
+    The last call is pad(remainingSeconds).
+    When you call format_time_display(61):
+    The calculations result in:
+    total_hours = 0
+    remaining_minutes = 1
+    remaining_seconds = 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
+    Answwer; 01
+    Third Call: pad(remaining_seconds) (where remaining_seconds = 1)
+    Value of num for the last call: 1
+    Return value: '01'

-Original file line number
+Diff line change
@@ Expand Up / @@ -3,22 +3,36 @@ @@
     // 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) {
+      // Expect time in "HH:MM" format
       const hours = Number(time.slice(0, 2));
+      const mins = time.slice(3);
+      if (hours === 0) {
+        return `12:${mins} am`;
+      }
+      if (hours === 12) {
+        return `12:${mins} pm`;
+      }
       if (hours > 12) {
-        return `${hours - 12}:00 pm`;
+        const newHr = hours - 12;
+        // pad single digits like 1:00 -> 01:00
+        return `${String(newHr).padStart(2, "0")}:${mins} pm`;
       }
       return `${time} am`;
     }
-    const currentOutput = formatAs12HourClock("08:00");
-    const targetOutput = "08:00 am";
+    let currentOutput = formatAs12HourClock("08:00");
+    let targetOutput = "08:00 am";
     console.assert(
       currentOutput === targetOutput,
       `current output: ${currentOutput}, target output: ${targetOutput}`
     );
-    const currentOutput2 = formatAs12HourClock("23:00");
-    const targetOutput2 = "11:00 pm";
+    let currentOutput2 = formatAs12HourClock("23:00");
+    let targetOutput2 = "11:00 pm";
     console.assert(
       currentOutput2 === targetOutput2,
       `current output: ${currentOutput2}, target output: ${targetOutput2}`
@@ Expand Down @@

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Sheffield | 25-ITP-Sep | Xiayidan Abuxuukuer | Sprint 2 | Coursework #781

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Sheffield | 25-ITP-Sep | Xiayidan Abuxuukuer | Sprint 2 | Coursework #781

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cjyuan Oct 23, 2025

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