Friday 9 January 2015

The Bitwise Operators

There are following bitwise operators supported by JavaScript language
Assume variable A holds 2 and variable B holds 3 then:


OperatorDescriptionExample
& Called Bitwise AND operator. It performs a Boolean AND operation on each bit of its integer arguments. (A & B) is 2 .
|Called Bitwise OR Operator. It performs a Boolean OR operation on each bit of its integer arguments. (A | B) is 3.
^Called Bitwise XOR Operator. It performs a Boolean exclusive OR operation on each bit of its integer arguments. Exclusive OR means that either operand one is true or operand two is true, but not both. (A ^ B) is 1.
~Called Bitwise NOT Operator. It is a is a unary operator and operates by reversing all bits in the operand. (~B) is -4 .
<<Called Bitwise Shift Left Operator. It moves all bits in its first operand to the left by the number of places specified in the second operand. New bits are filled with zeros. Shifting a value left by one position is equivalent to multiplying by 2, shifting two positions is equivalent to multiplying by 4, etc.(A << 1) is 4.
>>Called Bitwise Shift Right with Sign Operator. It moves all bits in its first operand to the right by the number of places specified in the second operand. The bits filled in on the left depend on the sign bit of the original operand, in order to preserve the sign of the result. If the first operand is positive, the result has zeros placed in the high bits; if the first operand is negative, the result has ones placed in the high bits. Shifting a value right one place is equivalent to dividing by 2 (discarding the remainder), shifting right two places is equivalent to integer division by 4, and so on. (A >> 1) is 1.
>>>Called Bitwise Shift Right with Zero Operator. This operator is just like the >> operator, except that the bits shifted in on the left are always zero, (A >>> 1) is 1. 

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