Question

Is there a way to initialize empty arrays in Javascript the same empty arrays are intialized in php?

$blah = array("0" => "wew", "1" => "fdafa");

foreach ($blah as $blat => $val) {
              $arr[] = $val
              $arr[$blah][] = 1; 
}

Or just

foreach ($blah as $blat => $val) {
                  $arr[] = $val
    }

Answer 1

No, you have to declare the var and initialize it to [] before pushing items to it.

var blah = {"0":"wew", "1":"fdafa"}; // an object, not an array

var arr = [];
var obj = {}
for (var blat in blah) {
    var val = blah[blat];
    arr.push(val);
    obj[blat] = 1; 
}