main.js (1445B)
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 /** 22 * Returns an accumulator function which incrementally updates a count. 23 * 24 * @returns {Function} accumulator function 25 * 26 * @example 27 * var accumulator = incrcount(); 28 * 29 * var count = accumulator(); 30 * // returns 0 31 * 32 * count = accumulator( 2.0 ); 33 * // returns 1 34 * 35 * count = accumulator( -5.0 ); 36 * // returns 2 37 * 38 * count = accumulator(); 39 * // returns 2 40 */ 41 function incrcount() { 42 var count = 0; 43 return accumulator; 44 45 /** 46 * If provided a value, the accumulator function returns an updated count. If not provided a value, the accumulator function returns the current count. 47 * 48 * @private 49 * @param {number} [x] - new value 50 * @returns {number} count 51 */ 52 function accumulator() { 53 if ( arguments.length === 0 ) { 54 return count; 55 } 56 count += 1; 57 return count; 58 } 59 } 60 61 62 // EXPORTS // 63 64 module.exports = incrcount;