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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 incrmax = require( '@stdlib/stats/incr/max' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a maximum value, ignoring `NaN` values.
*
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrnanmax();
*
* var max = accumulator();
* // returns null
*
* max = accumulator( 3.14 );
* // returns 3.14
*
* max = accumulator( NaN );
* // returns 3.14
*
* max = accumulator( -5.0 );
* // returns 3.14
*
* max = accumulator( 10.1 );
* // returns 10.1
*
* max = accumulator();
* // returns 10.1
*/
function incrnanmax() {
var max = incrmax();
return accumulator;
/**
* If provided a value, the accumulator function returns an updated maximum value. If not provided a value, the accumulator function returns the current max, while ignoring `NaN` values.
*
* @private
* @param {number} [x] - new value
* @returns {(number|null)} max value or null
*/
function accumulator( x ) {
if ( arguments.length === 0 ) {
return max();
}
if ( isnan( x ) ) {
return max();
}
return max( x );
}
}
// EXPORTS //
module.exports = incrnanmax;
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