Bitwise operators

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Bitwise operators treat their operands as a sequence of 32 bits zeroes and onesrather than as decimal, hexadecimal, or octal numbers. For example, the decimal number nine has a binary representation of Bitwise operators perform their operations on such binary representations, but they return standard JavaScript numerical values. The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https: The operands of all bitwise operators are converted to signed bit integers in two's complement format.

Two's complement format means that a number's negative counterpart e. For example, the following encodes the integer The two's complement guarantees that the left-most bit is 0 when the number is positive and 1 when the number is negative. Thus, it is called the sign bit. The number hexadecimal representation: The numbers and are the minimum and the maximum integers representable through a 32bit signed number.

Performs the AND operation on each pair of bits. The truth table for the AND operation is:. Bitwise ANDing any number x with 0 yields 0. Bitwise ANDing any number x with -1 yields x. Performs the OR operation on each pair of bits. The truth table for the OR operation is:. Bitwise ORing any number x with 0 yields x. Bitwise ORing any number x with -1 yields Performs the XOR operation on each pair of bits. The truth table for the XOR operation is:.

Bitwise XORing any number x with 0 yields x. Performs the NOT operator on each bit. NOT a yields the inverted value a. The truth table for the NOT operation is:. The bitwise shift operators take two operands: The direction of the shift operation is controlled by the operator used.

Shift operators convert their operands to bit integers in big-endian order and return a result of the same type as the left operand. The right operand should be less than 32, but if not only the low five bits will be used. This operator shifts the first operand the specified number of bits to the left. Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right. This operator shifts the first operand the specified number of bits to the right.

Excess bits shifted off to the right are discarded. Copies of the leftmost bit are shifted in from the left. Since the new leftmost bit has the same value as the previous leftmost bit, the sign bit the leftmost bit does not change. Hence the name "sign-propagating".

Zero bits are shifted in from the left. The sign bit becomes 0, so the result is always non-negative. For non-negative numbers, zero-fill right shift and sign-propagating right shift yield the same result.

However, this is not the case for negative numbers. The bitwise logical operators are often used to create, manipulate, and read sequences of flagswhich are like binary variables. Variables could be used instead of these sequences, but binary flags take much less memory by a factor of These flags are represented by a sequence of bits: When a flag is setit has a value of 1.

When a flag is clearedit has a value of 0. Suppose a variable flags has the binary value Since bitwise operators are bit, is actuallybut the preceding zeroes can be neglected since they contain no meaningful information. Typically, a "primitive" bitmask for each flag is defined:. New bitmasks can be created by using the bitwise logical operators on these primitive bitmasks. Individual flag values can be extracted by ANDing them with a bitmask, where each bit with the value of one will "extract" the corresponding flag.

The bitmask masks out the non-relevant flags by ANDing with zeroes hence the term "bitmask". For example, the following two are equivalent:. Flags can be set by ORing them with a bitmask, where each bit with the value one will set the corresponding flag, if that flag isn't already set. For example, the bitmask can be used to set flags C and D:. Flags can be cleared by ANDing them with a bitmask, where each bit with the value zero will clear the corresponding flag, if it isn't already cleared.

This bitmask can be created by NOTing primitive bitmasks. For example, the bitmask can be used to clear flags A and C:.

Flags can be toggled by XORing them with a bitmask, where each bit with the value one will toggle the corresponding flag. For example, the bitmask can be used to toggle flags B and C:. Convert a binary String to a decimal Number:.

Convert a decimal Number to a binary String:. If you want to create an Array of Booleans from a mask you can use this code:.

For didactic purpose only since there is the Number. The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https: Get the latest and greatest from MDN delivered straight to your inbox.

Please check your inbox or your spam filter for an email from us. Document Tags and Contributors Tags: Contributors to this page: Learn the best of web development Get the latest and greatest from MDN delivered straight to your inbox. I'm okay with Mozilla handling my info as explained in this Privacy Policy. Please check your inbox to confirm your subscription. Returns a 1 in each bit position for which the corresponding bits of both operands are 1 's. Returns a 1 in each bit position for which the corresponding bits of either or both operands are 1 's.

Returns a 1 in each bit position for which the corresponding bits of either but not both operands are 1 's. Defined in several sections of the specification: Bitwise OR a b.

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