Should You Use Dependency Injection in JavaScript?

Should You Use Dependency Injection in JavaScript?

I have seen some posts on JavaScript and for other languages that dissuade the use of Dependency Injection. Dependency Injection (DI), sometimes referred to as ‘Inversion of Control’, is when an object receives other objects or functions it depends on for part of its functionality.

I have seen some posts on JavaScript and for other languages that dissuade the use of Dependency Injection. I even had a boss at one company I worked for tell his developers that we should never use Dependency Injection.

Dependency Injection (DI), sometimes referred to as ‘Inversion of Control’, is when an object receives other objects or functions it depends on for part of its functionality. This can be achieved by passing an object through object instantiation with a constructor or with a property setting. This is very common in the world of statically typed languages like Java or C#. There are many popular frameworks built specifically for managing dependencies in the statically typed object-oriented world.

DI allows specific functionality to be loaded at runtime. One of the advantages of being able to change the functionality of an object at runtime is to provide greater flexibility and make our applications more loosely coupled. A very common use case is using mocking during testing. There are some great libraries in Node.js like Sinon that make mocking very easy, but we can accomplish the same task by using DI.

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