index.js (1576B)
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 * If a predicate function returns a truthy value, invoke `x`; otherwise, invoke `y`. 23 * 24 * @module @stdlib/utils/async/if-then 25 * 26 * @example 27 * var randu = require( '@stdlib/random/base/randu' ); 28 * var ifthenAsync = require( '@stdlib/utils/async/if-then' ); 29 * 30 * function predicate( clbk ) { 31 * setTimeout( onTimeout, 0 ); 32 * function onTimeout() { 33 * clbk( null, randu() > 0.5 ); 34 * } 35 * } 36 * 37 * function x( clbk ) { 38 * setTimeout( onTimeout, 0 ); 39 * function onTimeout() { 40 * clbk( null, 1.0 ); 41 * } 42 * } 43 * 44 * function y( clbk ) { 45 * setTimeout( onTimeout, 0 ); 46 * function onTimeout() { 47 * clbk( null, -1.0 ); 48 * } 49 * } 50 * 51 * function done( error, result ) { 52 * if ( error ) { 53 * throw error; 54 * } 55 * console.log( result ); 56 * } 57 * ifthenAsync( predicate, x, y, done ); 58 */ 59 60 // MODULES // 61 62 var ifthenAsync = require( './if_then_async.js' ); 63 64 65 // EXPORTS // 66 67 module.exports = ifthenAsync;