## Question 3
Please explain what is the bug in the following Javascript function, and how to correct it.

```javascript
function createArrayOfFunctions(y) {
var arr = [];
for(var i = 0; i<y; i++) {
arr[i] = function(x) { return x + i; }
}
return arr;
}
```
## Answer 3
There is a semantic issue in given Javascript snippet.

The variable 'i' is type of 'var', then all createArrayOfFunctions function will share the same value of 'i'.

For example

```javascript
  let result = createArrayOfFunctions(100);
  console.log(result[10](10)); //the output should be 20, but the output is 110
  console.log(result[20](10)); //the output should be 30, but the output is 110
  console.log(result[30](10)); //the output should be 40, but the output is 110
```
In above program all the functions share same value of 'i' i.e. 100.

Then if we want to get the correct output, we can modify the type of 'i' to let as below:

```javascript
function createArrayOfFunctions(y) {
  var arr = [];
  for(let i = 0; i<y; i++) {
    arr[i] = function(x) { return x + i; }
  }
  return arr;
}

  let result = createArrayOfFunctions(100);
  console.log(result[10](10)); //the output is 20
  console.log(result[20](10)); //the output is 30
  console.log(result[30](10)); //the output is 40
```