What is the difference between Array.length = 0 and Array =[]?

foo=[];

             Creates a new Array without affecting the older reference variables.

foo.length=0;

             Creates a new Array by affecting the older reference variables.


Example:

var foo = ['f','o','o'];
var bar = ['b','a','r'];
var foo2 = foo;
var bar2 = bar;

foo = []; //Creates a new Array without affecting the reference variable 

bar.length = 0; //Creates a new Array by affecting the reference variable
var foo3=foo; //Notice the difference for foo2 and foo3 

console.log("foo is",foo, "bar is",bar);
console.log("foo2 is",foo2,"bar2 is",bar2);
console.log("foo3 is:",foo3);

Output:

"foo is" Array [] "bar is" Array []
"foo2 is" Array ["f", "o", "o"] "bar2 is" Array []
"foo3 is:" Array []