69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isFunction = require( '@stdlib/assert/is-function' );
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// MAIN //
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/**
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* If a condition is truthy, invokes `x`; otherwise, invokes `y`.
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*
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* @param {boolean} bool - condition
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* @param {Function} x - function to invoke if a condition is truthy
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* @param {Function} y - function to invoke if a condition is falsy
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* @throws {TypeError} second argument must be a function
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* @throws {TypeError} third argument must be a function
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* @returns {*} return value of either `x` or `y`
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*
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* @example
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* var randu = require( '@stdlib/random/base/randu' );
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*
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* function x() {
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* return randu() * 100.0;
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* }
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*
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* function y() {
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* return -1.0 * randu() * 100.0;
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* }
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*
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* var z = ifthen( randu() > 0.5, x, y );
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* // returns <number>
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*/
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function ifthen( bool, x, y ) {
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if ( !isFunction( x ) ) {
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throw new TypeError( 'invalid argument. Second argument must be a function. Value: `'+x+'`.' );
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}
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if ( !isFunction( y ) ) {
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throw new TypeError( 'invalid argument. Third argument must be a function. Value: `'+y+'`.' );
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}
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if ( bool ) {
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return x();
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}
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return y();
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}
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// EXPORTS //
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module.exports = ifthen;
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