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Question 156: let not part of global object #810

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Question 156: let not part of global object #810

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31 changes: 31 additions & 0 deletions README.md
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Expand Up @@ -5149,3 +5149,34 @@ The condition within the `if` statement checks whether the value of `!typeof ran

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###### 156. What's the output?

```javascript
var x = "global!";
let y = "global!";
function helper(){
x = "local!";
y = "local!";
console.log('X is ',this.x);
console.log('Y is ',this.y);
}
helper()
```

- A: `X is global! | Y is global!`
- B: `X is global! | Y is local!`
- C: `X is local! | Y is local!`
- D: `X is local! | Y is undefined`

<details><summary><b>Answer</b></summary>
<p>

#### Answer: D

At the top level of programs and functions, `let`, unlike `var`, does not create a property on the global object.

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