I've never implemented singleton in JavaScript and found it interesting 🙂
Is there a way to prevent a singleton class to be newed up in JavaScript?
In C#, one can declare a constructor as private, constraining people to use ClassName.instance.
JavaScript doesn't have private and public distinction (yet), so the short answer is - no.
The long one is - you can have private methods in TypeScript (and, private constructor). I've created a simple demo and – while TypeScript linter shouts that this is an error (noting that constructor is indeed private), this gets compiled to JavaScript as a regular class that can have multiple instances. So I guess it's the compiler's job to fail here.
Yes, TypeScript is a great tool and I use it recently for almost everything. The best thing is, it's JavaScript superset, so you don't really have to know everything and can just build your knowledge while working on a project. Create a plain JS code then slowly fill the type coverage as you go :)
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Thank you for the post Tomek.
I've never implemented singleton in JavaScript and found it interesting 🙂
Is there a way to prevent a singleton class to be
newed up in JavaScript?In C#, one can declare a constructor as private, constraining people to use
ClassName.instance.Hi, and thanks foe your kind words!
JavaScript doesn't have private and public distinction (yet), so the short answer is - no.
The long one is - you can have private methods in TypeScript (and, private
constructor). I've created a simple demo and – while TypeScript linter shouts that this is an error (noting thatconstructoris indeed private), this gets compiled to JavaScript as a regular class that can have multiple instances. So I guess it's the compiler's job to fail here.Thanks Tomek for the follow-up~ 🙏
That sounds like another great reason to use TypeScript 🙂
Yes, TypeScript is a great tool and I use it recently for almost everything. The best thing is, it's JavaScript superset, so you don't really have to know everything and can just build your knowledge while working on a project. Create a plain JS code then slowly fill the type coverage as you go :)