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Why this code gives an error after modification ?

 
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Can you please get me in proper way that why this output is ?



Now, if i write it i different way than, it gives an error. Why ?

 
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Can you post the exact error you get?
It would help us explain the error to you.
 
SunilK Chauhan
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ReferenceError: p is not defined
   at eval:6:13
   at eval
   at new Promise

This is the error shown above while running the code.
 
Dave Tolls
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Right.
And 'p' is not defined, except as part of 'o'.
It is not something that can be referred to directly.
Unlike foo and bar, which are defined in line 2, though I can't remember what that syntax is called.
 
SunilK Chauhan
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Thanks for the reply,

I got understand the funda working behind the code.
 
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Also bear in mind that with ES6 you should be favoring let and const over var.
 
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