Iterating or loop through the elements of an array is with a for loop (for):
var keys = Object.keys(o); // Get an array of property names for object o
var values = [] // Store matching property values in this array
for(var i = 0; i < keys.length; i++) { // For each index in the array
var key = keys[i]; // Get the key at that index
values[i] = o[key]; // Store the value in the values array
}