@stdlib/fs/read-file-list/lib/delay.js

Filesystem APIs.

/**
* @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 pow = require( '@stdlib/math/base/special/pow' );


// MAIN //

/**
* Computes an exponential delay.
*
* @private
* @param {NonNegativeInteger} retries - number of retries
* @param {number} max - maximum delay
* @returns {NonNegativeInteger} exponential delay
*/
function delay( retries, max ) {
	var d = pow( 2, retries ) - 1;
	if ( d > max ) {
		d = max;
	}
	return d;
}


// EXPORTS //

module.exports = delay;