What is JavaScript >>> Operator and How to use it ?
The JavaScript >>> represents zero-fill right shift operator. It is also called the unsigned right bit shift operator. It comes under the category of Bitwise operators. Bitwise operators treat operands as 32-bit integer numbers and operate on their binary representation.
Zero-fill right shift (>>>) operator:
It is a binary operator, where the first operand specifies the number and the second operand specifies the number of bits to shift. The operator shifts the bits of the first operand by a number of bits specified by the second operand. The bits are shifted to the right and those excess bits are discarded, while 0 bit is added from left. As the sign bit becomes 0, the operator ( >>> ) returns a 32-bit non-negative integer.
Example:
Input: A = 6 ( 00000000000000000000000000000110 ) B = 1 ( 00000000000000000000000000000001 ) Output: A >>> B = 3 ( 00000000000000000000000000000011 )
Syntax:
result = expression1 >>> expression2
Difference between >>> and >> :
The difference between these two is that the unsigned zero-fill right shift operator (>>>) fills with zeroes from the left, and the signed right bit shift operator (>>) fills with the sign bit from the left, thus it maintains the sign of the integer value when shifted.
Example: This example implements the use of >>> operator:
- Program:
<!DOCTYPE html><html><head><title>>>> Operator in JavaScript</title><style>body {text-align: center;}h1 {color: green;}</style></head><body><h1>GeeksforGeeks</h1><h3>The >>> Operator in JavaScript</h3><script>document.write("For non negative number:<br>");var a = 12;// Shift right two bitsvar b = 2;document.write("a = " + a + " , b = " + b);document.write("<br>a >>> b = " + (a >>> b) + '<br>');document.write("<br>For negative number:<br>");var a = -10;// Shift right two bitsvar b = 3;document.write("a = " + a + " , b = " + b);document.write("<br>a >>> b = " + (a >>> b) + '<br>');</script></body></html> - Output:
Explanation: For non-negative numbers, zero-fill right shift (>>>) and sign-propagating right shift (>>) gives the same output. For example, 9 >>> 2 and 9 >> 2 gives same result i.e. 2. But for negative numbers, -9 >>> 2 gives 1073741821 and -9 >> 2 gives -3 as output.
Case 1: non-negative number
12 (base 10): 00000000000000000000000000001100 (base 2)
--------------------------------
12 >>> 2 (base 10): 00000000000000000000000000000011 (base 2)
= 3 (base 10)
Case 2: negative number
-10 (base 10): 11111111111111111111111111110110 (base 2)
--------------------------------
-10 >>> 3 (base 10): 00011111111111111111111111111110 (base 2)
= 536870910 (base 10)
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