How do you set, clear and toggle a single bit in JavaScript?

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7 Answers

javascriptcleartoggle
90%

Use OR operator to set the particular bit.,Get the mask by mask = 1 << setBit, this mask is helpful in setting, clearing as well in toggling the bit.,Get the position of the bit to be set(starts from right, first bit is at 0 position), Ex. (bitSet = 3),Get the position of the bit to be clear(starts from right, first bit is at 0 position), Ex. (bitSet = 3)

88%

How to set, clear, toggle and check a bit in JavaScript?,To learn more, see our tips on writing great answers.,Connect and share knowledge within a single location that is structured and easy to search.,Please be sure to answer the question. Provide details and share your research!

To get a bit mask:

var mask = 1 << 5; // gets the 6th bit

To test if a bit is set:

if ((n & mask) != 0) {
   // bit is set
} else {
   // bit is not set
}

To set a bit:

n |= mask;

To clear a bit:

n &= ~mask;

To toggle a bit:

n ^= mask;
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72%

How to set, clear, toggle and check a bit in JavaScript?,To test if a bit is set:,Refer to the Javascript bitwise operators.,Examples has been taken from JavaScript Algorithms and Data Structures repository.

To get a bit mask:

var mask = 1 << 5; // gets the 6th bit

To test if a bit is set:

if ((n & mask) != 0) {
   // bit is set
} else {
   // bit is not set
}

To set a bit:

n |= mask;

To clear a bit:

n &= ~mask;

To toggle a bit:

n ^= mask;
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65%

Bitwise Operators mainly use in low-level programming. Using the bit-wise operators we can set bit, check bit, clear or toggle the bits of an integral type. In the embedded system, a bit-wise operator performs the bit-wise operation on an individual bit of a PORT or Register.,Clearing a bit means that if N-th bit is 1, then clear it to 0 and if it is 0 then leave it unchanged. Bitwise AND operator (&) use to clear a bit of integral data type. “AND” of two bits is always zero if any one of them is zero.,Toggling a bit means that if the N-th bit is 1, then change it to 0 and if it is 0 then change it to 1. Bitwise XOR (^) operator use to toggle the bit of an integral data type. To toggle the nth bit shift the ‘1’ nth position toward the left and “XOR” it.,Setting an N-th bit means that if the N-th bit is 0, then set it to 1 and if it is 1 then leave it unchanged. In C, bitwise OR operator (|) use to set a bit of integral data type. As we know that | (Bitwise OR operator) evaluates a new integral value in which each bit position is 1 only when operand’s (integer type) has a 1 in that position.

In simple words, you can say that “Bitwise OR ” of two bits is always one if any one of them is one.

That means,

0 | 0 = 0
1 | 0 = 1
0 | 1 = 1
1 | 1 = 1
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75%

To toggle a particular bit of a number, we can use bitwise XOR operator (^), it toggles the bit – it changes the status of the bit if the bit is set – it will be un-set, and if the bit is un-set – it will be set.,To set a particular bit of a number, we can use bitwise OR operator (|), it sets the bits – if the bit is not set, and if the bit is already set, bit’s status does not change.,To clear a particular bit of a number, we can use bitwise AND operator (&), it clears the bit – if the bit is set, and if the bit is already cleared, bit’s status does not change.,Let suppose there is a number num and we want to toggle the Xth bit of it, then the following statement can be used to toggle Xth bit of num

Let suppose there is a number num and we want to set the Xth bit of it, then the following statement can be used to set Xth bit of num

    num |= 1 << x;
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40%

You can use structs and then apply them in your code, to set, clear and toggle bits.,There can be many times when we need to set, clear or toggle a bit in C Language so in this article which is from answer on our website,That will clear bit x. You must invert the bit string with the bitwise NOT operator (~), then AND it.,The XOR operator (^) can be used to toggle a bit.

struct bits {
   unsigned int a: 1;
   unsigned int b: 1;
   unsigned int c: 1;
};

struct bits mybits;
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22%

To Set / Clear and Toggle a single bit in C++ see the methods below.,Use the bitwise OR operator (|) to set a bit.,How to Set / Clear and Toggle a single bit in C/C++,Use the bitwise AND operator (&) to clear a bit.

Use the bitwise OR operator (|) to set a bit.

number |= 1 << x;
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