Fixed the errors in the 1-key-errors folder

Author: alizada-dev

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

@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> I think the variable 'str' is repeated twice in string literals.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +9,11 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
+// =============> The error occurs because some parts of the code are not allowed in JS.
+//                The variable 'str' is already declared in line 7 as a parameter
 // =============> write your new code here
+
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`
+}
+console.log(capitalise("shop"));

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

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> variable 'decimalNumber' is repeated already declared as a parameter in line 8
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +14,12 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> Again, the error is a syntax error.
+//                The variable 'decimal' is already declared as a parameter
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  return `${decimalNumber * 100}%`
+}

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
+// =============> The error occurs because we have not defined 'num'
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
+// =============> It is a syntaxError: Enexpected number
 
-// =============> explain this error message here
+// =============> In line 8, the number as a parameter is not expected; instead, a variable is expected.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+function square(num) {
+    return num * num;
+}