node.js -> getParents performance poor

[campaign]

getParents : function( closerFirst )

{

var node = this; var parents = [];

do {

parents[ closerFirst ? 'push' : 'unshift' ]( node );

} while ( ( node = node.getParent() ) )

return parents;

},

unshift method performance poor example code

var t = +new Date,s = [] for(var i = 0;i<1000;i++){

s.push(i)

}; s.reverse(); alert(+new Date - t) 2

var t = +new Date,s = [] for(var i = 0;i<1000;i++){

s.unshift(i)

};

alert(+new Date - t) 21

in ie8