re: Elegant patterns in modern JavaScript: Ice Factory VIEW POST


There is a series of books you (and anyone actually) should read about JS, to proper understand JS. For example, this is already a Pattern in that book, without the object.froze. You should consider as well understand what does froze, and what it does not.

I also start into programming with C++, and Java, and when I started with JS I wanted JS to behave like a proper language. Having more than 3 years working with JS the one think I can tell you is, hug JS. It have it weirdness, but it will surprise you if you let him.

If you want some kind of static type check, I strongly suggest you to use Typescript. But also, you will need a proper level of understanding about what Typescript does, because it will compile to JS at the end.

The books are You don't know JS. I think they cover most of the design patterns used in JS.


Thanks for the feedback.

YDKJS is a great series of books which I have read and would recommend for sure. The author has generously made the entire thing available for free on github.

Hopefully, it comes through in this article (and its predecessor) that I am not claiming to have "invented" these patterns.

I give credit here to Crockford on the Object.freeze formulation but, of course, the idea of a Factory goes back to the original Gang of Four patterns and the idea of a Factory Function has been prominent in JavaScript programming for as long as I can remember. We are all standing on the shoulders of giants.

As for static type checking and Typescript. While it can be helpful at design time, it's completely absent at runtime because – as you pointed out – it just transpiles into JavaScript. So, it doesn't absolve you from having to code defensively for runtime input.

There is also – as I think you eluded to – a great deal of misunderstanding about what TypeScript is and how it works. TypeScript does not give you static types in JavaScript because JavaScript is not capable of static typing. So, TypeScript uses structural types which is just a formalization of duck typing.

Erirc Elliot's article on TypeScript is worth a gander for an interesting discussion of the cost/benefit of TypeScript and similar tools.

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