exercise 1.2 done

Author: M-Abdoon

.gitignore

@@ -2,4 +2,5 @@ node_modules
 .DS_Store
 .vscode
 testing.js --- IGNORE ---
+testing.js
 **/.DS_Store

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

@@ -7,7 +7,7 @@
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
-@@ -10,4 +14,14 @@ function capitalise(str) {
+function capitalise(str) {
 }
 
 // =============> write your explanation here

testing.js

@@ -1,6 +1,36 @@
-function capitaliseFirstLetter(string){
-  string = `${string[0].toUpperCase()}`;
-  return string;
+// Predict and explain first...
+// the code is supposed to convert a decimal number to percentage by multiplying 
+// the decimal Number by 100 then add the sign % to show that it is a percentage
+
+// Why will an error occur when this program runs?
+// =============> write your prediction here
+// an error will occur because the variable decimalNumber is redeclared inside the function.
+// it's already declared as a parameter of the function, so redeclaring it with const causes a syntax error.
+
+// Try playing computer with the example to work out what is going on
+
+function convertToPercentage(decimalNumber) {
+  const decimalNumber = 0.5;
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(decimalNumber);
+
+// =============> write your explanation here
+// the fucntion convertToPercentage has a parameter named decimalNumber,
+// but inside the function, there is a line that tries to declare a new constant with the same name decimalNumber.
+// there is no need to redeclare the variable or edit it since it is a user input.
+// also the variable decimalNumber is called from outside the function which menas from another scope.
+// that is wrong because the variable can only be used inside the fucntion. instead of that we need to call the funtion, not hte variable.
+
+// Finally, correct the code to fix the problem
+// =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
 }
 
-console.log(capitaliseFirstLetter("hello"));
+console.log(convertToPercentage(0.3));