convert php to javascript #1 - php

Question

I'm trying to convert this awesome pathfinding php function from http://granularreverb.com/a_star.php to javascript.
PHP function
function path_float(&$heap, &$values, $i, $index) {
for (; $i; $i = $j) {
$j = ($i + $i%2)/2 - 1;
if ($values[$heap[$j]] < $values[$index])
break;
$heap[$i] = $heap[$j];
}
$heap[$i] = $index;
}
JAVASCRIPT function
var $path_f;
var $path_h;
var $path_g;
var $path_open_heap;
function path_float($path_open_heap, $path_f, i, index) { // return heap & values
var j;
for (; i; i = j) {
j = (parseInt(i) + parseInt(i)%2)/2 - 1;
if($path_f[$path_open_heap[j]] < $path_f[index] ){
break;
}
$path_open_heap[i] = $path_open_heap[j];
}
$path_open_heap[i] = index;
}
I'm not sure if javascript understands for() without all elements? If i try to execute javascript function my browser freezes.
P.s. i'm not interested in pre-written js pathdindings, because i need identical php and js function.
Thanks in advance

Answer 1

You can use for without all the elements in javascript similar to PHP. So that is not the problem.
I think the problem is the float that is returned to J. it could be that it never realy is 0 but might be some large float like 0.00000000001 or something and thus never evaluates to false. Unfortunately I cannot test it as You did not provide any input values.
Try the following:
var $path_f;
var $path_h;
var $path_g;
var $path_open_heap;
function path_float($path_open_heap, $path_f, i, index) { // return heap & values
var j;
for (; i; i = parseInt(j)) {
j = (parseInt(i) + parseInt(i)%2)/2 - 1;
if($path_f[$path_open_heap[j]] < $path_f[index] ){
break;
}
$path_open_heap[i] = $path_open_heap[j];
}
$path_open_heap[i] = index;
}