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

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Answer 1

function xyz() { .. } blocks are defined at parse time. If many functions have the same name, it's the last defined which takes the precedence.

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However, you can define functions at runtime using statements :

var say = function() { alert( "ABOVE" ); }
say(); 
say = function() { alert( "BELOW" ); }

will output ABOVE. (JSFiddle)