time-to-botec

Benchmark sampling in different programming languages
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main.js (2940B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2018 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var isArrayLike = require( '@stdlib/assert/is-array-like-object' );
     24 var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
     25 var isNegativeZero = require( '@stdlib/math/base/assert/is-negative-zero' );
     26 var isnan = require( '@stdlib/math/base/assert/is-nan' );
     27 var PINF = require( '@stdlib/constants/float64/pinf' );
     28 var NINF = require( '@stdlib/constants/float64/ninf' );
     29 
     30 
     31 // MAIN //
     32 
     33 /**
     34 * Returns an accumulator function which incrementally computes minimum and maximum values.
     35 *
     36 * @param {Collection} [out] - output array
     37 * @throws {TypeError} output argument must be array-like
     38 * @returns {Function} accumulator function
     39 *
     40 * @example
     41 * var accumulator = incrminmax();
     42 *
     43 * var mm = accumulator();
     44 * // returns null
     45 *
     46 * mm = accumulator( 2.0 );
     47 * // returns [ 2.0, 2.0 ]
     48 *
     49 * mm = accumulator( -5.0 );
     50 * // returns [ -5.0, 2.0 ]
     51 *
     52 * mm = accumulator( 3.0 );
     53 * // returns [ -5.0, 3.0 ]
     54 *
     55 * mm = accumulator( 5.0 );
     56 * // returns [ -5.0, 5.0 ]
     57 *
     58 * mm = accumulator();
     59 * // returns [ -5.0, 5.0 ]
     60 */
     61 function incrminmax( out ) {
     62 	var minmax;
     63 	var min;
     64 	var max;
     65 	var FLG;
     66 	if ( arguments.length === 0 ) {
     67 		minmax = [ 0.0, 0.0 ];
     68 	} else {
     69 		if ( !isArrayLike( out ) ) {
     70 			throw new TypeError( 'invalid argument. Output argument must be an array-like object. Value: `' + out + '`.' );
     71 		}
     72 		minmax = out;
     73 	}
     74 	min = PINF;
     75 	max = NINF;
     76 	FLG = false;
     77 	return accumulator;
     78 
     79 	/**
     80 	* If provided a value, the accumulator function returns updated minimum and maximum values. If not provided a value, the accumulator function returns the current minimum and maximum values.
     81 	*
     82 	* @private
     83 	* @param {number} [x] - input value
     84 	* @returns {(ArrayLikeObject|null)} output array or null
     85 	*/
     86 	function accumulator( x ) {
     87 		if ( arguments.length === 0 ) {
     88 			if ( FLG === false ) {
     89 				return null;
     90 			}
     91 			minmax[ 0 ] = min; // Why? Because we cannot guarantee someone hasn't mutated the output array
     92 			minmax[ 1 ] = max;
     93 			return minmax;
     94 		}
     95 		FLG = true;
     96 		if ( isnan( x ) ) {
     97 			min = x;
     98 			max = x;
     99 		} else {
    100 			if ( x < min || ( x === min && isNegativeZero( x ) ) ) {
    101 				min = x;
    102 			}
    103 			if ( x > max || ( x === max && isPositiveZero( x ) ) ) {
    104 				max = x;
    105 			}
    106 		}
    107 		minmax[ 0 ] = min;
    108 		minmax[ 1 ] = max;
    109 		return minmax;
    110 	}
    111 }
    112 
    113 
    114 // EXPORTS //
    115 
    116 module.exports = incrminmax;