Iterate through object properties

Question

var obj = { 

name: "Simon", 

age: "20", 

clothing: { 

style: "simple",

hipster: false 

  } 

} 

for(var propt in obj){ 

console.log(propt + ': ' + obj[propt]);

}

How does the variable propt represent the properties of the object? It's not a built-in method or property. Why does it come up with every property in the object?

Answer 1

If you want to iterate though object properties than you can use hasOwnProperty method see the code below:-

for (var property in object) { 

if (object.hasOwnProperty(property)) { 

// do stuff 

 } 

}

The hasOwnProperty method simply checks to see if this is a property specific to this class, and not one inherited from the base class.