Iterate stuff in Javascript

gistfile1.txt

var foo = {
  key1: "a",
  key2: "b",
  key3: "c"
};

// node, modern browsers
Object.keys(foo).forEach(function (key, i, keys) {
  console.log(key, foo[key]);
});

// everything
for (var key in foo){
  if(foo.hasOwnProperty(key)){
    console.log(key, foo[key]);
  }
}

var baz = ["foo", "bar", "baz"];

// node, modern browsers
baz.forEach(function(value, index, array){
  console.log(value, index);
});

// everything
for (var i = baz.length - 1; i >= 0; i--) {
  console.log(baz[i], i);
}