Using the Firebug console

Question

I have added Firebug in my browser. Why am I getting the output as undefined when I type the following in the terminal of Firebug?

console.log('Testing console');

I was expecting the text "Testing console" to appear.

And also, I have installed Firebug light in Chrome. How do I get the search box?

Answer 1

You should see both:

> console.log('Testing console');
"Testing console"
undefined

console.log logs to the console, but doesn't return a value.

Answer 2

Try with

First type this

var testingString = 'Testing Console'

you will get undefined

later type this.

console.log(testingString)

you will get 'Testing Console'

But, why you get always undefined ?

Well this is what happened first it runs testingString which return "testing console" string and followed it return value of console.log() , which is "undefined" .

If you don't want to get 'undefined' just type

"Testing console"

Hope you get the idea.