javascript - Invoking function of a returned object from function prints undefined -

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var unique = function(){  var n=0; return function(){      return {          inc : function(){             n++;             console.log(n);         }      };   }; };  console.log(unique()().inc());

the code above prints 1 , undefined reason undefined gets printed ?

because asked log value returned inc, , doesn't return anything.

if don't want print anything,

console.log(unique()().inc());

should be

unique()().inc();

if expect new value of n printed,

inc : function(){ n++; console.log(n); }

should be

inc : function(){ n++; console.log(n); return n; }

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