Sprint2

Author: HannaOdud

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

@@ -1,13 +1,19 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> my explanation: I see here declaration of str variable, which already exist as an argument. It will cause an error.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
-
+//===============>SyntaxError: Identifier 'str' has already been declared, its occured while execution of code.
+/*
 function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
-
-// =============> write your explanation here
+  */
+// =============> write your explanation here. My explanation: We have to change the name of variable and return it in order to fix an error.
 // =============> write your new code here
+function capitalise(str) {
+  let strChanged = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return strChanged;
+}
+console.log(capitalise("some string"));

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

@@ -1,20 +1,28 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> write your prediction here. My prediction: Value decimalNumber is a  parameter to the convertToPercentage. We don't need to declare it at line 10. 
+// =============> Also at line 16, we have to call function coverToPercentage with an argument. 
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
+/*function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
 console.log(decimalNumber);
-
-// =============> write your explanation here
+*/
+// =============> write your explanation here. My explanation: We need to modify this function. I'm going to remove line where decimalNumber is declared and execute the function properly.
 
 // 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(0.1));

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

@@ -3,18 +3,23 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
-
+// =============> write your prediction of the error here My prediction: There is an error with parameter.
+/*
 function square(3) {
     return num * num;
 }
+console.log(square)
+*/
+// =============> write the error message here: SyntaxError: Unexpected number 
 
-// =============> write the error message here
-
-// =============> explain this error message here
+// =============> explain this error message here: An error because of invalid parameter.
 
 // 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

@@ -1,14 +1,21 @@
 // Predict and explain first...
 
-// =============> write your prediction here
-
+// =============> write your prediction here: This function return nothing.
+/*
 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
+*/
+// =============> write your explanation here: We need to modify this function. 
+// =============> Create a new variable where we have to do the following calculation, after that return this new variable.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  resultOfMultiply = a*b;
+  return resultOfMultiply
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

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

@@ -1,13 +1,19 @@
 // Predict and explain first...
-//  =============> write your prediction here
-
+//  =============> write your prediction here: wrong calculation and return nothing.
+/*
 function sum(a, b) {
   return;
   a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
-
-// =============> write your explanation here
+*/
+// =============> write your explanation here: We need to create a variable where we have to store our calculation and return it.
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> write your new code 
+function sum(a, b) {
+  resultOfAdding = a + b;
+  return resultOfAdding
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

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

@@ -1,24 +1,34 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
-
+// =============> Write your prediction here: Function getLastDigit return num. 
+/*
 const num = 103;
 
 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)}`);
-
+*/
 // Now run the code and compare the output to your prediction
-// =============> write the output here
+// =============> write the output here: output is last digit of variable num.
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> write your explanation here: Because num is global and function's parameter is absent .
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+const num = 103;
+
+function getLastDigit(num) {
+  let digit = num.toString().slice(-1);
+  return digit
+}
+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

@@ -16,4 +16,7 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
+    resultBmi = weight/Math.pow(height,2);
+    return resultBmi.toFixed(1);
+}
+console.log(calculateBMI(70, 1.73));

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

@@ -14,3 +14,9 @@
 // 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 upperSnakeCase(text){
+    let textUpper = text.toUpperCase();
+    return textUpper.replace(" ", "_");
+}
+console.log(upperSnakeCase("hello here"));

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

@@ -1,6 +1,27 @@
+/*
 // In Sprint-1, there is a program written in interpret/to-pounds.js
 
 // You will need to take this code and turn it into a reusable block of code.
 // 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 penceStringWithoutTrailingP;
+    if (penceString.charAt(penceString.length - 1) == "p"){
+        penceStringWithoutTrailingP = penceString.substring( 0, penceString.length - 1);
+    } else {
+        penceStringWithoutTrailingP = penceString;
+    }
+    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("200");
+toPounds("200p");
+toPounds("20");
+toPounds("2");

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

@@ -17,18 +17,23 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> // 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?
-// =============> write your answer here
+// =============> 61%60=1/61-1/60=1/60%60=0, the value assigned to num when pad called for the first time is 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: 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
+// =============> write your answer here: "01" because of .padStart(2, "0")
+console.log(pad(0));
+console.log(pad(1));
+console.log(pad(123));
+console.log(formatTimeDisplay(61));
+