51.
The object has three object attributes namely

52.
Consider the following code snippet :
var book = {
    "main title": "JavaScript", 
    'sub-title': "The Definitive Guide", 
    "for": "all audiences", 
    author: { 
      firstname: "David", 
      surname: "Flanagan" 
    }
  };
In the above snippet, firstname and surname are

53.
A linkage of series of prototype objects is called as :

54.
Consider the below given syntax
book[datatype]=assignment_value;
In the above syntax, the datatype within the square brackets must be

55.
To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the

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