And the answer whether it is worth it
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.
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.
Since ECMAScript 2015 are two keywords usable:
extends. But both of them aren’t a thing compared to real object orientation.
Gif by thePLANK via imgur
Even if you are going to count this into object orientation, JS got no interfaces at all.
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