Javascript functions: var func = someFunction() and var func = someFunction? -

 var funchi = function() {      var a=6;     var b=5;     return a+b;     };  var withbrace = funchi(); var withoutbrace = funchi;  console.log("with braces: "+withbrace)     //'reference 1' console.log("without braces: "+withoutbrace)          //'reference 2' console.log("without braces: "+withoutbrace())         //'reference 3' 

the code pretty simple , clear. 'reference 1' , 'reference 3', console show 11 i'm not clear use 'reference 2'. 'refernce 2', console show complete function instead of showing 11. many times, use 'reference 2' thing (e.g. window.onload = initall) how useful.

window.onload = initall;  //what do? why not 'window.onload = initall()' 

i not clear concept behind it. if possible, give me link lesson on thing?

in first case: withbrace contains result of calling funchi, therefore it's 11

in second case: withoutbrace references function funchi. therefore withoutbrace === funchi, can withoutbrace function, same function funchi. can call function funchi via withoutbrace doing withoutbrace() , 11 - which third case.

var funchi = function() {    var a=6;   var b=5;   return a+b; };  //assigning result of calling funchi withbrace var withbrace = funchi();   typeof funchi;    //function typeof withbrace; //number withbrace === 11  //true, withbrace 11, result of calling funchi  //assigning funchi withoutbrace var withoutbrace = funchi;   typeof funchi;           //function typeof withoutbrace;     //function withoutbrace === funchi; //true, same function  funchi();       //11 withoutbrace(); //11, return same thing since withoutbrace points funchi