Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @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' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* If a predicate function returns a truthy value, invokes `x`; otherwise, invokes `y`.
*
* @param {Function} predicate - predicate function
* @param {Function} x - function to invoke if a condition is truthy
* @param {Function} y - function to invoke if a condition is falsy
* @param {Function} done - callback to invoke upon completion
* @throws {TypeError} first argument must be a function
* @throws {TypeError} second argument must be a function
* @throws {TypeError} third argument must be a function
* @throws {TypeError} last argument must be a function
*
* @example
* var randu = require( '@stdlib/random/base/randu' );
*
* function predicate( clbk ) {
* setTimeout( onTimeout, 0 );
* function onTimeout() {
* clbk( null, randu() > 0.5 );
* }
* }
*
* function x( clbk ) {
* setTimeout( onTimeout, 0 );
* function onTimeout() {
* clbk( null, 1.0 );
* }
* }
*
* function y( clbk ) {
* setTimeout( onTimeout, 0 );
* function onTimeout() {
* clbk( null, -1.0 );
* }
* }
*
* function done( error, result ) {
* if ( error ) {
* throw error;
* }
* console.log( result );
* }
* ifthenAsync( predicate, x, y, done );
*/
function ifthenAsync( predicate, x, y, done ) {
if ( !isFunction( predicate ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', predicate ) );
}
if ( !isFunction( x ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', x ) );
}
if ( !isFunction( y ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a function. Value: `%s`.', y ) );
}
if ( !isFunction( done ) ) {
throw new TypeError( format( 'invalid argument. Last argument must be a function. Value: `%s`.', done ) );
}
predicate( clbk1 );
/**
* Callback invoked by a predicate function.
*
* @private
* @param {(Error|null)} error - error object
* @param {boolean} bool - condition
* @returns {void}
*/
function clbk1( error, bool ) {
if ( error ) {
return done( error );
}
if ( bool ) {
return x( clbk2 );
}
y( clbk2 );
}
/**
* Callback invoked by either `x` or `y`.
*
* @private
* @param {(Error|null)} error - error object
* @param {...*} args - results
* @returns {void}
*/
function clbk2( error ) {
var nargs;
var i;
if ( error ) {
return done( error );
}
nargs = arguments.length;
const args = [null];
for ( i = 1; i < nargs; i++ ) {
args.push(arguments[ i ]);
}
done.apply( null, args );
}
}
// EXPORTS //
module.exports = ifthenAsync;
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