JavaScript Operators Easy Questions and Answers | Page - 1

JavaScript Operators

The below code snippet is equivalent to __________.
```
x = ~-y;
w = x = y = z;
q = a?b:c?d:e?f:g;
```

x = a?b:(c?d:(e?f:g));
q = ~(-y); w = (x = (y = z));

x = (x = (y = z));w = ~(-y);
q = a?b:(c?d:(e?f:g));

x = ~(-y); w = (x = (y = z)); 
q = (c?d:(e?f:g));

x = ~(-y); w = (x = (y = z));
q = a?b:(c?d:(e?f:g));

None of these

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NA

Correct Option: D

Brackets have higher precedence than any other operator. The placement of brackets results in the same result as without putting any bracket.

“An expression that can legally appear on the left side of an assignment expression.” is a well known explanation for variables, properties of objects, and elements of arrays. They are called

1. Definition
1. Properties
1. Prototypes
1. Lvalue
1. None of these

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Correct Option: D

lvalue is a historical term that means “an expression that can legally appear on the left side of an assignment expression.” In JavaScript, variables, properties of objects, and elements of arrays are lvalues.

Among the following, which one is a ternary operator?

1. ?:
1. –
1. :
1. +
1. None of these

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NA

Correct Option: A

JavaScript supports one ternary operator, the conditional operator ?:, which combines three expressions into a single expression. If else case can be replaced by the conditional operator

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

1. exist
1. exists
1. in
1. within
1. None of these

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NA

Correct Option: C

The operator “in” tests whether a particular property exists or not. In operator is usually added in looping statements to traverse the array or the object.

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

1. Invocation Expression
1. Constructor Calling Expression
1. Primary Expression
1. Object Creation Expression
1. None of these

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Correct Option: D

An object creation expression creates a new object and invokes a function (called a constructor) to initialize the properties of that object. Object creation expressions are like invocation expressions except that they are prefixed with the keyword new.