delay.js (1066B)
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 pow = require( '@stdlib/math/base/special/pow' ); 24 25 26 // MAIN // 27 28 /** 29 * Computes an exponential delay. 30 * 31 * @private 32 * @param {NonNegativeInteger} retries - number of retries 33 * @param {number} max - maximum delay 34 * @returns {NonNegativeInteger} exponential delay 35 */ 36 function delay( retries, max ) { 37 var d = pow( 2, retries ) - 1; 38 if ( d > max ) { 39 d = max; 40 } 41 return d; 42 } 43 44 45 // EXPORTS // 46 47 module.exports = delay;