Asynchronous module definition

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Instead of loading files one after the other, AMD can load them all separately, even when they are dependent on each other.

Asynchronous module definition (AMD) is a JavaScript specification that defines an API for defining code modules and their dependencies, and loading them asynchronously if desired. Implementations of AMD provide the following benefits:

  • Website performance improvements. AMD implementations load smaller JavaScript files, and only load them when they are needed.
  • Fewer page errors. AMD implementations allow developers to define dependencies that must load before a module is executed, so the module does not try to use outside code that is not yet available.

In addition to loading multiple JavaScript files at runtime, AMD implementations allow developers to encapsulate code in smaller, more logically-organized files in a way similar to other programming languages such as Java. For production and deployment, developers can concatenate and minify JavaScript modules based on an AMD API into one file, the same as traditional JavaScript.

The AMD specification is implemented by Dojo Toolkit, RequireJS, and ScriptManJS.