completed the key-errors requirements file

Author: Ebrahim-Moqbel

Sprint-3/1-key-errors/0.js

@@ -1,13 +1,30 @@
 // Predict and explain first...
 //  =============> write your prediction here
+/*
+I predict the function will throw a SyntaxError as the variable str has already been declared in the function parameter  
+function capitalise will capitalise the first letter with index 0 
+and will append the sliced string from index 1 which is the second letter
+*/
 
 // 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;
-}
+/* syntax Error :identifier the variabel has already been declared. 
+As we can see the str variable has already been declared in the prameter of the function instead we just return the value */
+
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   return str;
+// }
 
 // =============> write your explanation here
+/* syntax Error :identifier the variabel has already been declared. 
+As we can see the str variable has already been declared in the prameter of the function instead we just return the value */
+
 // =============> write your new code here
+function capitalise(str) {
+    return str[0].toUpperCase()+str.slice(1);
+
+}
+console.log(capitalise("ebrahim"));
+console.log(capitalise('salomi'));

Sprint-3/1-key-errors/1.js

@@ -3,18 +3,29 @@
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
-// Try playing computer with the example to work out what is going on
+//1- The function is trying to declare the decimalNumber twice in the perameter and later as a new variable
+//2-console.log() is printing a variable in the local scope where it can't be accessed as it is inside the function
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+// Try playing computer with the example to work out what is going on
 
-  return percentage;
-}
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
 
-console.log(decimalNumber);
+//   return percentage;
+// }
 
 // =============> write your explanation here
+/* The variable decimal Number has already been declared in the parameter 
+ and already is a local variable which can't be declared again causing a SyntaxError  
+As the decimalNumber inside the function we can't print it using the console.log() as it has no power to the local scope
+instead we can delete the second declaration and just leave the parameter as an input for the user 
+ Finally, correct the code to fix the problem */
 
-// 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-3/1-key-errors/2.js

@@ -1,20 +1,28 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+//I predict the funciton will throw a SyntaxEror as the perametters sould be valid variables like names or identifiers with upholding to the variable naming convention and in this case a number found
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
+//the Error is a syntax error: Unexpected number
 
 // =============> explain this error message here
+/* The function was givin a number as its perameter where in JS only allows varaible names and usnig a number causes a SyntaxError
+ Also, the function was returning num*num where num is undefined causing a syntax error 
+ */
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+  return num * num;
+}
 
+console.log(square(25));