Complete 1-key-errors

Author: jakr-s

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

@@ -1,13 +1,18 @@
 // Predict and explain first...
-//  =============> write your prediction here
+// The function is supposed to convert the first character of a string to uppercase
+// There will be a syntax error due to the redeclaration of the variable 'str'
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+capitalise("hello");
+
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   return str;
+// }
+
+// The error occurred because 'str' was declared again with 'let', which is not allowed.
 
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
 }
-
-// =============> write your explanation here
-// =============> write your new code here

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

@@ -1,20 +1,26 @@
 // Predict and explain first...
+// The function is intended to take a decimal number and convert it to a percentage (e.g. 1.5 => 150%)
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// There will be a syntax error due to the redeclaration of the variable 'decimalNumber'
 
 // 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
+// Redeclaring the variable decimalNumber causes a syntax error
+// The parameter decimalNumber cannot be logged to the console as it is a parameter and holds no value until the function is called
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  return `${decimalNumber * 100}%`;
+}
+
+console.log(convertToPercentage(0.5));

Sprint-2/1-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
+// A number is not a valid parameter (Syntax Error)
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
-// =============> write the error message here
+// Failed to instrument Sprint-2/1-key-errors/2.js
+//    7 |
+// >  8 | function square(3) {
+//      |                 ^ SyntaxError: Unexpected token (8:16)
+//    9 |     return num * num;
+//   10 | }
+//   11 |
+//     at <rootDir>/Sprint-2/1-key-errors/2.js:8:16
 
-// =============> explain this error message here
+// parameter names cannot start with a digit
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
-
+function square(num) {
+  return num * num;
+}
 
+console.log(square(3));