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librarySystem with dependencies
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| // librarySystem with dependencies | |
| (function () { | |
| var libraryStorage = {}; | |
| function librarySystem(libraryName, dependencies, callback) { | |
| // If librarySystem is called in 'create' mode, store the library. | |
| if (arguments.length === 3) { | |
| // If the library has dependencies, fetch the dependencies first and then store the library. | |
| if (dependencies.length > 0) { | |
| var fetchedDependencies = dependencies.map(function (dependencyName) { | |
| return librarySystem(dependencyName); | |
| }); | |
| libraryStorage[libraryName] = callback.apply(null, fetchedDependencies); | |
| // If the library has no dependencies, store the library without any additional steps. | |
| } else { | |
| libraryStorage[libraryName] = callback(); | |
| } | |
| // If librarySystem is called in 'use' mode, return the library. | |
| } else if (arguments.length === 1) { | |
| return libraryStorage[libraryName]; | |
| // If librarySystem is called in neither 'create' nor 'use' mode, throw an error. | |
| } else { | |
| throw new TypeError('Invalid argument(s)'); | |
| } | |
| } | |
| window.librarySystem = librarySystem; | |
| })(); | |
| // Tests | |
| // Test Suite 1 | |
| librarySystem('dependency', [], function() { | |
| return 'loaded dependency'; | |
| }); | |
| librarySystem('app', ['dependency'], function(dependency) { | |
| return 'app with ' + dependency; | |
| }); | |
| librarySystem('app'); // 'app with loaded dependency' | |
| // Test Suite 2 | |
| librarySystem('name', [], function() { | |
| return 'Gordon'; | |
| }); | |
| librarySystem('company', [], function() { | |
| return 'Watch and Code'; | |
| }); | |
| librarySystem('workBlurb', ['name', 'company'], function(name, company) { | |
| return name + ' works at ' + company; | |
| }); | |
| librarySystem('workBlurb'); // 'Gordon works at Watch and Code' |
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