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Understanding the State of Modules in JavaScript , Apr 2019

By : Abram Scharf Posted April 9, 2019 Reading Time: 2 minutes
No. of views: 15

There are numerous web applications that are running on JavaScript. Learning a programming language is a very complicated task for students. There are many crucial concepts in JavaScript and students often face troubles in understanding them. If you are also learning this programming language, then you can get JavaScript assignment help from the experts of BookMyEssay.

When we talk about the modules of the JavaScript, it refers to small units of independent and reusable code. Modularising codebase is the best practice of JavaScript. It can be beneficial in many ways, for example, it becomes easier to share the code within the team, it simplifies code maintainability and you can share code between the front-end and back-end components of the stack. ECMAScript modules (ESM) are the official standard that offers various techniques that consume the JavaScript modules to create JavaScript modules. It also has a feature called Dynamic Imports that specifies the technique to dynamical load these modules. Now you can get assignment help in Newcastle on this topic.

States of Modules in JavaScript

ECMAScript Modules: ESM has three important features called imports, exports & dynamic imports
  • These are the characteristics of JavaScript modules.
  • You can use modules to import other JavaScript modules
  • It can export a subset of the full module
  • The design of JavaScript modules makes it easier to statistically analyze the code structure of imports and exports.
  • These JavaScript Modules are expected to follow strict mode.
Exports: The export has two different types: default exports and named exports. One module can have many named exports but there is only single default export for every module. In ESM you export a binding a module and this binding has a direct connection with the exported value. Re-Exports: The ES module has a special feature called “re-exporting” which can export the export of other modules. Imports: Like exports, an import statement must be at the top level of a module. It is not possible to enclose it within a function. It provides you greater flexibility over what could be done with CJS/AMD and it negates a trend to generate the separate module. Dynamic imports: The dynamic imports have features like import call for module loading. It is used to meet the requirements of asynchronous module loading in browsers. Dynamic imports are supported in Babel and TypeScript.  It allows you to combine multiple dynamic imports and the result delivered by them is fairly intuitive code. Debugging with Chrome DevTools: The dependency chain is unclear when you use one module to import another module. The network panel has initiator column which shows the line and code triggered the download of the relevant JavaScript module. Node.js modules: It follows the CommonJS modules. The environment must have three variables: export, require and module.
  • Export: A module exports values by assigning their value to the properties on the export object.
  • Require: It imports other modules’ export using their module ids.
  • Module: It provides metadata such as id and URI of the current module.