for,forEach loops example

for-forEach-example.js

var obj, key, arr;

obj = {
  foo: 'bar',
  baz: 'faz'
};

for(key in obj){
  console.log(key, ':', obj[key]);
}

arr = [
  'foo',
  'bar'
];

arr.forEach(function(value, key){
  console.log('arr[%s] = %s', key, value);
});