JavaScript: dynamic instance of class based on variable

Asked Jun 11 '21 at 10:02

Active Jun 11 '21 at 10:02

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Let's suppose that a library offers different classes (lib.Class1, lib.Class2, lib.Class3, ...). I have a variable "name" which stores the name of the class to be instantiated (Example: const name = "Class2").

How can I dynamically instantiate a class based on the variable? For example: const myClass = new lib.name(params); (I know this doesn't work).

I don't want to build any map myself because the library can change over time and offer different classes.

Can Reflect be any useful?

I know there is this question but it is creating a "map" which I'd like to avoid: Create an instance of a class in ES6 with a dynamic name?.

edited Jun 11 '21 at 10:02

asked Jun 11 '21 at 10:02

Michele Tuloski Furci

3

Have you tried `new lib[name](params)` – cbr Jun 11 '21 at 10:02
1

Oh god, was it really that simple? *Facepalm*. Now I'm questioning my JS skills XD. – Michele Tuloski Furci Jun 11 '21 at 10:05
I am not sure if there is another way – Muhammad Usman Jun 11 '21 at 10:06
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"*it is creating a "map" which I'd like to avoid*" - `lib` already is such a map :-) – Bergi Jun 11 '21 at 10:11
I once worked with a guy who didn't trust `instance.method()` so he always wrote `instance['method']()`. The two things are equivalent throughout JS. – O. Jones Jun 11 '21 at 10:15

JavaScript: dynamic instance of class based on variable

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