/** * @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 isFunction = require( '@stdlib/assert/is-function' ); // MAIN // /** * If a function does not throw, returns the function return value; otherwise, returns the return value of a second function `y`. * * @param {Function} x - function to try invoking * @param {Function} y - function to invoke if a function throws * @throws {TypeError} first argument must be a function * @returns {*} the return value of either `x` or `y` * * @example * var randu = require( '@stdlib/random/base/randu' ); * * function x() { * if ( randu() < 0.5 ) { * throw new Error( 'beep' ); * } * return 1.0; * } * * function y() { * return randu(); * } * * var z = trythen( x, y ); * // returns */ function trythen( x, y ) { if ( !isFunction( x ) ) { throw new TypeError( 'invalid argument. First argument must be a function. Value: `'+x+'`.' ); } if ( !isFunction( y ) ) { throw new TypeError( 'invalid argument. Second argument must be a function. Value: `'+y+'`.' ); } try { return x(); } catch ( error ) { return y( error ); } } // EXPORTS // module.exports = trythen;