How You Can Use Dependency Injection in JavaScript

How You Can Use Dependency Injection in JavaScript

Learn how you can use Dependency Injection in JavaScript. This leads to the conclusion of can being able to do an object-oriented Dependency Injection in JavaScript, doesn’t it? Dependency injection solves a problem in statically typed, object-oriented languages that would not exist if they were no static type system. And the answer whether it is worth it

And the answer whether it is worth it

The moment has come, and you have  thought about decoupling components in JavaScript and also Fry is observing you suspiciously.

Decoupling components is a mighty weapon against cluttered code bases and breaking changes. Load this weapon with a magazine of  Dependency Injection (DI).

Therefore, DI enables you the replacement of dependencies without having to change the class that uses them. It can also reduce the risk for a change of a class just because one of its dependencies changed.

JavaScript and the Tale of Dependency Injection

Changing components means having an interface that specifies the interaction contract between two components.

Having interfaces means creating objects inferring from the interface.

Rely on interfaces instead of concrete classes and you get interchangeability since both components must fulfill the interface’s contract.

That means DI bases on decoupling concrete classes from dependencies by relying on contracts (interfaces) and not on concrete classes.

The key to success is to ask for contracts (interfaces) without knowing the concrete type to get the interchangeability we are searching for.

To make this possible, the language you are using has to support a powerful type system and lets you use interfaces.

Does JavaScript have interfaces? Does JavaScript have a static type system?

OOP Languages Do That, but JavaScript?

Since ECMAScript 2015 are two keywords usable: class and extends. But both of them aren’t a thing compared to real object orientation.

Both requirements to support DI are half-baked in JavaScript.

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It is more like syntactical sugar or magic to hide the JavaScript prototype-based inheritance.

Even if you are going to count this into object orientation, JS got no interfaces at all.

This leads to the conclusion of not being able to do an object-oriented Dependency Injection in JavaScript, doesn’t it?

programming javascript front-end-development

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