var PropertyValueSet = function (items, key, value, step, index, direction){ 
if (step === undefined) { 
step = 0; 
} 
if (index === undefined) { 
index = 0; 
} 
if (direction === undefined) { 
direction = 1; 
} 
var i; 
var t = 0; 
var end = _AN_Read_length('length', items); 
if (direction === 1) { 
for (i = index; i < end; i++ ){ 
items[i][key] = value + (t * step); 
t++ ; 
} 
} 
 else { 
for (i = index; i >= 0; i-- ){ 
items[i][key] = value + (t * step); 
t++ ; 
} 
} 
return items; 
} 
; 
module.exports = PropertyValueSet;