iteration5.js

var products = { 
  "widget": 400,
  "gear": 80,
  "crank": 375,
  "lever": 870,
};

Object.defineProperty(products, "gear", { enumerable: false });

// 1
var productKeys = Object.keys(products);
console.log("productKeys: ", productKeys);
  // logs productKeys:  [ "widget", "crank", "lever" ]

for (var i = 0; i < productKeys.length; i += 1) {
  var key = productKeys[i];
  console.log(key + " : " + products[key]);
}
  // logs "widget : 400", "crank : 375", "lever : 870"
  
// 2
for (var product in products) {
  console.log(product + " : " + products[product]);
}
  // logs "widget : 400", "crank : 375", "lever : 870"