February 2018
Intermediate to advanced
298 pages
8h 22m
English
Content preview from Learn ECMAScript - Second Edition
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JavaScript modules 101
The practice of breaking down programs and libraries into modules is called modular programming.
In JavaScript, a module is a collection of related objects, functions, and other components of a program or library that are wrapped together and isolated from the scope of the rest of the program or library.
A module exports some variables to the outside program to let it access the components wrapped by the module. To use a module, a program needs to import the module and the variables exported by the module.
A module can also be split into further modules called sub-modules, thus creating a module hierarchy.
Modular programming has many benefits. Some benefits are as follows:
- It keeps our code both cleanly separated ...
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