Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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 PINF = require( '@stdlib/constants/float64/pinf' );
var NINF = require( '@stdlib/constants/float64/ninf' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a range.
*
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrrange();
*
* var range = accumulator();
* // returns null
*
* range = accumulator( 3.14 );
* // returns 0.0
*
* range = accumulator( -5.0 );
* // returns 8.14
*
* range = accumulator( 10.1 );
* // returns 15.1
*
* range = accumulator();
* // returns 15.1
*/
function incrrange() {
var range;
var max = NINF;
var min = PINF;
return accumulator;
/**
* If provided a value, the accumulator function returns an updated range. If not provided a value, the accumulator function returns the current range.
*
* @private
* @param {number} [x] - new value
* @returns {(number|null)} range or null
*/
function accumulator( x ) {
if ( arguments.length === 0 ) {
return ( range === void 0 ) ? null : range;
}
if ( isnan( x ) ) {
min = x;
max = x;
}
if ( x > max ) {
max = x;
}
if ( x < min ) {
min = x;
}
range = max - min;
return range;
}
}
// EXPORTS //
module.exports = incrrange;
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