which and how javascript function will be called if we have 2 function declarations with the same name?

Question

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Answer 1

It's because the latter function overwrites the previous one. If you try to log the function:

console.log(say);

It will return only:

function say() { alert( "BELOW" ); } 

The "ABOVE" alert has been replaced with the "BELOW" alert. Similar to declaring a variable with the same name twice in the same scope - the latter would overwrite the former.

JSFiddle example.

Why? See http://www.adequatelygood.com/JavaScript-Scoping-and-Hoisting.html