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* @license Apache-2.0
*
* Copyright (c) 2018 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 isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
// MAIN //
/**
* Returns an accumulator function that computes a cumulative maximum while ignoring NaN values.
*
* @returns {Function} accumulator function
*
* @example
* var accumulator = nanmmax();
*/
function nanmmax() {
var max = null;
return accumulator;
/**
* If called without arguments, returns the current cumulative maximum.
* Otherwise, updates the cumulative maximum.
*
* @private
* @param {number} [x] - input value
* @returns {(number|null)} current cumulative maximum (or null if no non-NaN value seen yet)
*/
function accumulator( x ) {
if ( arguments.length === 0 ) {
return max;
}
if ( isnan( x ) ) {
return max;
}
if ( max === null ) {
max = x;
return max;
}
if (
x > max ||
( x === max && isPositiveZero( x ) )
) {
max = x;
}
return max;
}
}
// EXPORTS //
module.exports = nanmmax;
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