Check if a variable is in the scope or not in Javascript

Question

I need to check if a object "objCR" is present in the current scope or not. I tried using below code. ``` if(objCR == null) alert("object is not defined"); ``` Let me know where I am wrong.

Accepted Answer

Use the `typeof` operator:

```
if(typeof objCR == "undefined")
   alert("objCR is not defined");
```

Check if a variable is in the scope or not in Javascript

Solution

Problem