popcount

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[![Git tag][git-image]][git-url]
[![NPM version][npm-image]][npm-url]
[![Code style][standard-image]][standard-url]

Population count (aka hamming weight) function. Counts the number of set (i.e. 1-valued) bits in a 32-bit integer.

Installation

$ npm install @f/popcount

Usage

``js
var popcount = require('@f/popcount')

popcount(3) === 2
popcount(4) === 1
popcount(0xFF) === 8
popcount(0xFF, 3) === 3
`

API

$3

- x - The 32-bit integer who's population you wish to count
- n - Optional. The bit position to begin the count from. E.g. popcount(x, 8) returns the number of bits set below the 8th bit in x.

Returns: The number of bits set in x` below the nth position, if n is specified.

License

MIT

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[travis-url]: https://travis-ci.org/micro-js/popcount
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[git-url]: https://github.com/micro-js/popcount
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[npm-url]: https://npmjs.org/package/@f/popcount