JavaScript Operator MCQ

The result of the code is '105'.
In JavaScript, the + operator has two different meanings depending on the type of the operands.
If at least one of the operands is a string,
the + operator performs string concatenation.
In this case, the first 5 is converted to the string '5',
and the second 5 is also converted to the string '5', so the final result is '105'.

The result of the code is 0 .
In JavaScript, the - operator performs subtraction if both operands are numbers. .
In this case, the string '5' is converted to the number 5, so the final result is 5 - 5 = 0..

The result of the code is false.
The && operator in JavaScript performs a logical and operation, which means that it returns true only if both operands are truthy.
In this case, the first operand is truthy (true), but the second operand is false then the result is also false

The || operator in JavaScript performs a logical OR operation on its operands.
If either operand is truthy, the result is true, otherwise the result is false.
In this case, the first operand (x) is truthy (true), so the result of the || operation is true, regardless of the value of the second operand (y).

The instanceof operator in JavaScript is used to determine whether an object is an instance of a particular constructor or class.
In this case, the variable obj has been assigned an empty object.
The instanceof operator is called on obj, with Object as the right operand.
Since obj is an instance of the Object constructor, the instanceof operator will return true.

The instanceof operator in JavaScript is used to determine whether an object is an instance of a particular constructor or class. In this case, the variable foo has been assigned a function. The instanceof operator is called on foo, with Function as the right operand. Since foo is an instance of the Function constructor, the instanceof operator will return true.

The Symbol data type in JavaScript is a primitive data type that represents a unique identifier.
Symbols are created using the Symbol constructor, which takes an optional string description as an argument.
In this case, a new symbol is created using the Symbol constructor, with the string "foo" as the description.
The typeof operator is called on the symbol, which returns the string "symbol".

The Map data type in JavaScript is a constructor that creates a new map object, which is a collection of key-value pairs.
The Map constructor creates a new map object when it is called using the new keyword.
In this case, a new map object is created using the Map constructor, and is assigned to the variable map.
The instanceof operator is called on map, with Map as the right operand.
Since map is an instance of the Map constructor, the instanceof operator will return true.

Answer: C

Explanation: Seven months have a length of 31 days: January, March, May, July, August, October, and December.

The << operator in JavaScript is the left shift operator, which performs a bitwise left shift operation on its operands.
In this case, the << operator is called on x and y, with x as the first operand and y as the second operand.
Since x is 10 and y is 20, the result of the << operator will be the left shift of the binary representation of 10 by 20 bits, which is 100000 in decimal.

The >> operator in JavaScript is the right shift operator, which performs a bitwise right shift operation on its operands.
In this case, the >> operator is called on x and y, with x as the first operand and y as the second operand.
Since x is 10 and y is 20, the result of the >> operator will be the right shift of the binary representation of 10 by 20 bits, which is 0 in decimal.

The in operator in JavaScript is used to determine whether an object has a particular property.
In this case, the in operator is called on x and y, with x as the left operand and y as the right operand.
Since y is a string and does not have any properties, the in operator will return false.

The ^ operator in JavaScript is the bitwise XOR operator, which performs a bitwise XOR operation on its operands.
In this case, the ^ operator is called on x and y, with x as the first operand and y as the second operand.
Since x is 10 and y is 20, the result of the ^ operator will be the bitwise XOR of the binary representations of 10 and 20, which is 30 in decimal.

The startsWith method in JavaScript is a method that can be called on a string value to determine whether the string starts with the specified string.
In this case, the startsWith method is called on the string "Hello World!", with the string "Hello" as the argument.
Since the string "Hello World!" does start with the string "Hello", the startsWith method will return true.