declared global variable getting displayed undefined inside the function

Asked Dec 22 '17 at 11:29

Active Dec 22 '17 at 11:34

Viewed 36 times

When executing the following snippet getting data undefined. Data is declared above the function definition.Not understanding how it become undefined.

var data =100;

test();

function test() {

console.log('Data ',data)
if(false){
   var data ='ppp';
}
}

edited Dec 22 '17 at 11:30

Andy G

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asked Dec 22 '17 at 11:29

Javed IN

maybe add a space after the = – Squareoot Dec 22 '17 at 11:30
4

Because you have defined `data` again... And due to function scope you have 2 vars called data. – Keith Dec 22 '17 at 11:31
1

This is a hoisting effect, this [link](https://scotch.io/tutorials/understanding-hoisting-in-javascript) might be very interesting to you. – Blauharley Dec 22 '17 at 11:34
Thank you guys for useful info – Javed IN Dec 22 '17 at 11:36

declared global variable getting displayed undefined inside the function

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