the key-errors issues has been solved

Author: AhmadHmedann

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

@@ -1,13 +1,20 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> I predict it will throw a syntaxerror because the parameter  'str' is already declare in the definition,
+//and  line 9 try to declare another variable with the same name so the error will be identifier 'str'has already been declared .
+
 
 // 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;
+// }
+// capitalise("ahmadhmedan");
 
-// =============> write your explanation here
-// =============> write your new code here
+// =============> As I predict it will throw a SyntaxError: Identifier 'str' has already been declared
+//because in JavaScript we can not redeclare the same variable in the same scope. 
+function Capitalise(str){
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}
+console.log(Capitalise("ahmadHmedan"));

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

@@ -2,19 +2,29 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+// my prediction it will throw a syntaxerror because the parameter decimalNumber is already declare in the definition.
+//and  line 11 try to declare another variable with the same name so the error will be identifier 'str'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 = `${decimalNumber * 100}%`;
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+//   return percentage;
+// }
 
-console.log(decimalNumber);
+// console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> As I predicted, SyntaxError: Identifier '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

@@ -3,18 +3,21 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> // It will throw a syntaxerror because in the function definition we sit the parameter name not the value
 
-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
+// =============> As I predicted we must set the parameter name in the definition
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
-
+// =============> 
+    function square(num) {
+    return num * num;
+}
 
+console.log(square(3));