completed-1-key-errors

Author: Elisabeth-Matulian

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

@@ -9,5 +9,10 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
+// =============> write your explanation here 
+// It leeds to an error declaring the same variable name more than 1 time.
+// It also can confuse reassigning the variable str. it is better to remove it or made up a new one.  
 // =============> write your new code here
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}

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

@@ -1,8 +1,8 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
-
+// decimalNumber was already declared on the line 8. it leads to an error declaring it the second time on the line 9. 
+// line 15 is in global scope and tries output value of the local variable from inside of the function. 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
@@ -14,7 +14,13 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// i will declare the decimalNumber variable before the function and call the function. i would also removed the percentage variable because it doesn't make anything useful in this piece of code. 
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+const decimalNumber = 0.5;
+function convertToPercentage(decimalNumber) {
+  return `${decimalNumber * 100}%`;
+}
+
+console.log(convertToPercentage(decimalNumber))
+

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

@@ -4,17 +4,22 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+//reference error (not existing variable (num))
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
+//When we declare a function, it is expected that the parameter names will be in brackets. 
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
+function square(num) {
+    return num * num;
+}