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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var isInfinite = require( '@stdlib/math/base/assert/is-infinite' );
var floor = require( '@stdlib/math/base/special/floor' );
// MAIN //
/**
* Rounds a numeric value to the nearest integer with ties rounding to the nearest even integer.
*
* @param {number} x - input value
* @returns {number} function value
*
* @example
* var v = roundNearestEven( -3.5 );
* // returns -4.0
*
* @example
* var v = roundNearestEven( -4.2 );
* // returns -4.0
*
* @example
* var v = roundNearestEven( -4.5 );
* // returns -4.0
*
* @example
* var v = roundNearestEven( -4.6 );
* // returns -5.0
*
* @example
* var v = roundNearestEven( 9.99999 );
* // returns 10.0
*
* @example
* var v = roundNearestEven( 8.5 );
* // returns 8.0
*
* @example
* var v = roundNearestEven( 9.5 );
* // returns 10.0
*
* @example
* var v = roundNearestEven( 9.2 );
* // returns 9.0
*
* @example
* var v = roundNearestEven( 0.0 );
* // returns 0.0
*
* @example
* var v = roundNearestEven( -0.0 );
* // returns -0.0
*
* @example
* var v = roundNearestEven( Infinity );
* // returns Infinity
*
* @example
* var v = roundNearestEven( -Infinity );
* // returns -Infinity
*
* @example
* var v = roundNearestEven( NaN );
* // returns NaN
*/
function roundNearestEven( x ) {
var frac;
var int;
if ( isnan( x ) || isInfinite( x ) || x === 0.0 ) {
return x;
}
int = floor( x );
frac = x - int;
if ( frac > 0.5 ) { // Round up
return int + 1.0;
}
if ( frac < 0.5 ) { // Round down
return int;
}
// Tie case where we round to the nearest even integer:
return ( int % 2 === 0 ) ? int : int + 1.0;
}
// EXPORTS //
module.exports = roundNearestEven;
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