bit-vec

1.0.4 • Public • Published

bit-vec

Coverage Status npm version npm

A lightweight, performant and well documented BitArray/BitVector implementation written in javascript.

Installing

Via NPM: npm install bit-vec --save.

Getting Started

After installing

import BitVector from 'bit-vec';

const bitVec = new BitVector(8);

Example Usage:

import BitVector from 'bit-vec';

const bitVec = new BitVector(8);
bitVec.set(5, 1);
bitVec.test(5); // true
bitVec.flip(5);
bitVec.test(5); // false

// Chaining.
bitVec
  .set(5)
  .set(3)
  .set(1)
  .clearRange(0, 4)
  .test(3); // false

Condensed Documentation

Below is a condensed form of the documentation, each is a function that can be found on the BitVector object, called like so.

const bitVec = new BitVector(42);
bitVec.test(34); // false
bitVec.set(34, 1);
bitVec.test(34); // true
Method Parameters Return
.get(index) index:Number Number, 1 if set, 0 if not.
.set(index) index:Number Returns this with the bit set.
.test(index) index:Number Returns Boolean true if index is set, false otherwise .
.clear(index) index:Number Returns this with cleared bit.
.flip(index) index:Number Returns this with flipper bit.
.count() None Returns Number number of indices currently set to 1.
.setRange(begin, end, value = 1) begin:Number, end:Number, value:Number Returns this with bits set.
.clearRange(begin, end) begin:Number, end:Number Returns this with bits cleared.
.equals(bitVec) bitVec:BitVector Returns Boolean true if the two bit vectors are equal, false otherwise.
.notEquals(bitVec) bitVec:BitVector Returns Boolean true if the two bit vectors are different, false otherwise.
.or(bitVec) bitVec:BitVector Returns new BitVector object with the result of the operation.
.xor(bitVec) bitVec:BitVector Returns new BitVector object with the result of the operation.
.and(bitVec) bitVec:BitVector Returns new BitVector object with the result of the operation.
.not() None Returns new BitVector object with the result of the operation.
.invert() None Returns this with updated array.
.orEqual(bitVec) bitVec:BitVector Returns new BitVector object with the result of the operation.
.xorEqual(bitVec) bitVec:BitVector Returns new BitVector object with the result of the operation.
.andEqual(bitVec) bitVec:BitVector Returns new BitVector object with the result of the operation.
.notEqual() None Returns new BitVector object with the result of the operation.
.isEmpty() None Returns Boolean true if the bit vector has no set bits, false otherwise.

Full Documentation


get

bitVec.get(index)

Performs a get operation on the given index, retrieving the stored value (0 or 1).

Parameters
  • index -> Number for index: 0 <= index < bitVec.bits.
Returns

Number, 1 if set, 0 otherwise.

Example
bitVec.get(52); // 0

set

bitVec.set(index)

Performs a set operation on the given index, setting the value to either 0 or 1.

Parameters
  • index -> Number for index: 0 <= index < bitVec.bits.
  • value -> Number, 0 or 1, defaults to 1.
Returns

Returns BitVector for chaining with the bit set.

Example
bitVec.set(52); // BitVector

test

bitVec.test(index)

Tests whether the given index is set to 1.

Parameters
  • index -> Number for index: 0 <= index < bitVec.bits.
Returns

Returns Boolean true if index is set, false otherwise .

Example
bitVec.set(52, 1);
bitVec.test(52); // true

clear

bitVec.clear(index)

Clears the bit at the given index.

Parameters
  • index -> Number for index: 0 <= index < bitVec.bits.
Returns

Returns BitVector for chaining with the bit cleared.

Example
bitVec.set(52, 1);
bitVec.test(52); // true

flip

bitVec.flip(index)

Flips the bit at the given index.

Parameters
  • index -> Number for index: 0 <= index < bitVec.bits.
Returns

Returns BitVector for chaining with the bit cleared.

Example
bitVec.flip(52);

count

bitVec.count()

Counts the number of set bits in the bit vector.

Parameters
  • None
Returns

Returns Number number of indices currently set to 1.

Example
bitVec.count();

setRange

bitVec.setRange(begin, end, value = 1)

Sets a range of bits from begin to end.

Parameters
  • begin -> Number for index: 0 <= index < bitVec.bits.
  • end -> Number for index: 0 <= index < bitVec.bits.
  • value -> The value to set the index to (0 or 1).
Returns

Returns this with bits set.

Example
bitVec.setRange(2, 6);

clearRange

bitVec.clearRange(begin, end)

Clears a range of bits from begin to end.

Parameters
  • begin -> Number for index: 0 <= index < bitVec.bits.
  • end -> Number for index: 0 <= index < bitVec.bits.
Returns

Returns this with bits cleared.

Example
bitVec.clearRange(2, 6);

equals

bitVec.equals(otherBitVec)

Determines if two bit vectors are equal.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns Boolean true if the two bit vectors are equal, false otherwise.

Example
bitVec.equals(otherBitVec);

notEquals

bitVec.notEquals(otherBitVec)

Determines if two bit vectors are not equal.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns Boolean true if the two bit vectors are equal, false otherwise.

Example
bitVec.notEquals(otherBitVec);

or

bitVec.or(otherBitVec)

Performs the bitwise or operation between two BitVectors and returns the result as a new BitVector object.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns new BitVector object with the result of the operation.

Example
bitVec.or(otherBitVec);

xor

bitVec.xor(otherBitVec)

Performs the bitwise xor operation between two BitVectors and returns the result as a new BitVector object.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns new BitVector object with the result of the operation.

Example
bitVec.xor(otherBitVec);

and

bitVec.and(otherBitVec)

Performs the bitwise and operation between two BitVectors and returns the result as a new BitVector object.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns new BitVector object with the result of the operation.

Example
bitVec.and(otherBitVec);

not

bitVec.not()

Performs the bitwise not operation between two BitVectors and returns the result as a new BitVector object.

Parameters
  • None
Returns

Returns new BitVector object with the result of the operation.

Example
bitVec.not();

invert

bitVec.invert()

Inverts this BitVector, alias of .not().

Parameters
  • None
Returns

Returns new BitVector object with the result of the operation.

Example
bitVec.invert();

orEqual

bitVec.orEqual(otherBitVec)

Performs the bitwise or operation between two BitVectors and assigns the result to this BitVector.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns this for chaining with the bits set.

Example
bitVec.orEqual(otherBitVec);

xorEqual

bitVec.xorEqual(otherBitVec)

Performs the bitwise xor operation between two BitVectors and assigns the result to this BitVector.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns this for chaining with the bits set.

Example
bitVec.xorEqual(otherBitVec);

andEqual

bitVec.andEqual(otherBitVec)

Performs the bitwise and operation between two BitVectors and assigns the result to this BitVector.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns this for chaining with the bits set.

Example
bitVec.andEqual(otherBitVec);

notEqual

bitVec.notEqual(otherBitVec)

Performs the bitwise not operation between two BitVectors and assigns the result to this BitVector.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns this for chaining with the bits set.

Example
bitVec.notEqual(otherBitVec);

isEmpty

bitVec.isEmpty()

Tests whether this BitVector has any set bits.

Parameters
  • bitVec -> BitVector, instance of BitVector class.
Returns

Returns Boolean true if the bit vector has no set bits, false otherwise.

Example
bitVec.isEmpty();

License

See LICENSE file.

Resources

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Install

npm i bit-vec

Weekly Downloads

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Version

1.0.4

License

MIT

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Total Files

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Collaborators

  • cakroyd