Which of the operator is used to test if a particular property exists or not?

Which of the operator is used to test if a particular property exists or not?

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1) What kind of an expression is “new Point(2,3)”?

2) Consider the following snippet code

var string1 = ”123”;
 var intvalue = 123;
 alert( string1 + intvalue );

3) Initialization of variable can be done by writing _____ operator in between variable name and operand value.

4) Which of the operator is used to test if a particular property exists or not?

5) Among the following, which one is a ternary operator?