javascript - Difference between Array.length = 0 and Array =[]? -

can 1 explain conceptual difference between both of them. read somewhere second 1 creates new array destroying references existing array , .length=0 empties array. didn't work in case

//declaration  var arr = new array(); 

the below 1 looping code executes again , again.

$("#dummy").load("something.php",function(){    arr.length =0;// expected empty array    $("div").each(function(){        arr = arr + $(this).html();    }); }); 

but if replace code arr =[] in place of arr.length=0 works fine. can explain what's happening here.

foo = [] creates new array , assigns reference variable. other references unaffected , still point original array.

foo.length = 0 modifies array itself. if access via different variable, still modified array.

read somewhere second 1 creates new array destroying references existing array

that backwards. creates new array , doesn't destroy other references.

var foo = [1,2,3]; var bar = [1,2,3]; var foo2 = foo; var bar2 = bar; foo = []; bar.length = 0; console.log(foo, bar, foo2, bar2); 

gives:

[] [] [1, 2, 3] []