Consider following snippet:
 var nyc = { fullName: "New York City", mayor: "Bill de Blasio", population: 8000000, boroughs: 5 }; 
Which code will print all properties of nyc object?
Explanation
The for..in statement iterates over the enumerable properties of an object, in arbitrary order. For each distinct property, statements can be executed. Example:

var object = { 
   property: 'value',
   property2: 'value' 
}
for (var property in object) {
   // do something here
}

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