// wink-distance
// Distance functions for Bag of Words, Strings,
// Vectors and more.
//
// Copyright (C) GRAYPE Systems Private Limited
//
// This file is part of “wink-distance”.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// DEALINGS IN THE SOFTWARE.
/* eslint-disable no-bitwise */
// ## number
// ### hamming
/**
*
* Computes the the hamming distance between two numbers; each number is
* assumed to be decimal representation of a binary number.
*
* @method number.hamming
* @param {number} na the first number.
* @param {number} nb the second number.
* @return {number} hamming distance between `na` and `nb`.
*
* @example
* hamming( 8, 8 );
* // -> 0
* hamming( 8, 15 );
* // -> 3
* hamming( 9, 15 );
* // -> 2
*/
var hamming = function ( na, nb ) {
// Initialize hamming distance.
var distance = 0;
// Compute hamming distance.
for ( var xor = na ^ nb; xor > 0; distance += 1 ) xor &= ( xor - 1 );
return distance;
}; // hamming()
module.exports = hamming;
