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

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

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

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

4) Consider the following snippet code

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

The result would be

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

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