Typescript Private Method

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Is it possible to create a private "function" (method) within a TypeScript class? Let's assume we have the following Person.ts TypeScript file:
Which when compiled is being transformed to the following:
I was expecting the whisper function to be declared within the closure, but not on the prototype? Essentially this makes the whisper function public when compiled?
Richard
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TypeScript public/private keywords only apply to the way TypeScript checks your code - they don't have any effect on the JavaScript output.
Private visibility is a design-time construct; it is enforced during static type checking but does not imply any runtime enforcement. ... TypeScript enforces encapsulation of implementation in classes at design time (by restricting use of private members), but cannot enforce encapsulation at runtime because all object properties are accessible at runtime. Future versions of JavaScript may provide private names which would enable runtime enforcement of private members
This has already been asked and answered here: https://stackoverflow.com/a/12713869/1014822
Update: This old answer still gets an amount of traffic, so worth noting that, in addition to the language spec link above, public, private, and (now) protected members are covered in detail in the TypeScript handbook chapter on classes.
2018 Update Implementation of ES Private Fields is now a Future item on the TypeScript RoadMap although discussion suggests this will be a parallel hard private option, not a replacement for the current soft private implementation.
2020 Update Runtime private fields using the # operator have been implemented as of TS 3.8. There is a good discussion of how they work and how they differ from compile-time fields with the private keyword on StackOverflow here.
Private methods have reached stage 3 of the TC39 working group. The feature is currently in active discussion for TypeScript, for example here.
Jude Fisher
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Odd that the chapter on functions is silent on this. – StingyJack Mar 29 '17 at 22:33
In Javascript (as opposed to TypeScript), you can't have a private "member" function.
If you define a private function in the closure, you won't be able to call it as an instance method on an instance of your class.
If that's what you want, just move the TypeScript function definition outside the class body.
SLaks
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Hmm, I guess there where the var self = this; applies? Is it possible to declare a function within a closure that doesn't explicitly access any instance information? – Richard Jun 4 '13 at 13:49
@Richard: No; var self = this has nothing to do with this. The point is that there is no way to make instance.method() only work in your closure. – SLaks Jun 4 '13 at 13:51
Sure; but it is possible to simply call method() from within an instance (public) method, is it not? – Richard Jun 4 '13 at 13:53
Yes, but it will have nothing to do with the class. (although you can accept this as a parameter) – SLaks Jun 4 '13 at 13:54
It can be done, but every call to a private method would have to be done using apply() or call() with the instance "this". – Nomaed Jan 19 '16 at 7:52
You can use private class variables and functions in TypeScript/Webpack and even in the latest Google Chrome versions natively. Just add a # before the name. See here.
air5
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TypeScript provides three access modifiers to class properties and methods: private, protected, and public. The private modifier allows access within the same class. The protected modifier allows access within the same class and subclasses. The public modifier allows access from any location.
www.typescripttutorial.net/typescript-tutorial/typescri…
Can you add private properties to a class in typescript?
Can you add private properties to a class in typescript?
Using TypeScript, we can add private functionality into our classes. What are private properties or methods? A private property of method can only be accessed or called from the class instance itself.
coryrylan.com/blog/private-methods-and-…
Do you unit test private method in typescript?
Do you unit test private method in typescript?
Developers don’t test private method and rely on public method to reach those private methods. At first, it may sound that we are going inside those private methods, therefore we are doing proper unit testing.
patrickdesjardins.com/blog/how-to-unit-te…
Are there any compile time private methods in typescript?
Are there any compile time private methods in typescript?
Technically, in current versions of TypeScript private methods are only compile-time checked to be private - so you can call them.
stackoverflow.com/questions/48906484/ho…
Are there private methods and properties in JavaScript?
Are there private methods and properties in JavaScript?
Unfortunately, in the current version of JavaScript, there is no support for private properties or private methods yet. In JavaScript all class instance properties and methods are public. Using TypeScript, we can add private functionality into our classes.
coryrylan.com/blog/private-methods-and-…
https://coryrylan.com/blog/private-methods-and-properties-in-typescript-classes
Перевести · 18.06.2018 · TypeScript Private Methods . Methods can also be private which is useful for hiding implementation detail of how a Class works to the user of the Class. Let's take a look at a minimal example. …
https://stackoverflow.com/questions/16919473
Перевести · 03.06.2013 · In Javascript (as opposed to TypeScript), you can't have a private "member" function. If you define a private function in the closure, you won't be able to call it as an instance method on an instance of your class. If that's what you want, just move the TypeScript function …
TypeScript public/private keywords only apply to the way TypeScript checks your code - they don't have any effect on the JavaScript output. Accord...
In Javascript (as opposed to TypeScript), you can't have a private "member" function. If you define a private function in the closure, you won't be...
You can use private class variables and functions in TypeScript/Webpack and even in the latest Google Chrome versions natively. Just add a # befo...
TypeScript — язык программирования, представленный Microsoft в 2012 году и позиционируемый как средство разработки веб …
Класс языка: мультипарадигмальный : объектно-ориентированное · обобщённое · функциональное · императивное · аспектно-ориентированное · соб…
Расширение файлов: .ts · или · .tsx
Тип исполнения: компиляция в JavaScript
Испытал влияние: JavaScript · C# · Java иCoffeeScript
Текст из Википедии, лицензия CC-BY-SA
https://patrickdesjardins.com/blog/how-to-unit-test-private-method-in-typescript-part-2
Перевести · I already posted about how to write unit tests for private method with TypeScript about one year ago. Few days ago, I had the same discussion that I had in my previous team concerning private method. The situation is similar. Developers don’t test private method and rely on public method to reach those private methods.
https://www.valentinog.com/blog/private
Перевести · 03.03.2020 · As expected we're free to print Liz's age. The main take here is that private in TypeScript is not so private, and it feels convenient only at the TypeScript level, not for "real privacy".. And now let's get to the point: "native" private class fields in TypeScript. Private class fields in TypeScript
Static Methods Can Access Private Class Constructors In TypeScript
Static Methods Can Access Private Class Constructors In TypeScript
The "private" access modifier in Typescript classes: Learning Typescript by example #012
Thinking About Static vs. Private Methods In TypeScript / Angular 2
https://stackoverflow.com/questions/40931506
Перевести · 02.12.2016 · How to correctly define private abstract methods in TypeScript? Here is a simple code: abstract class Fruit { name: string; constructor (name: string) { this.name = name } abstract private hiFrase …
https://stackoverflow.com/questions/56044471
Перевести · 08.05.2019 · Private methods are compiled to normal JavaScript prototype methods, so you can use the any type to let the spy creation pass through the TypeScript type checking. Here is a highly simplified …
https://github.com/microsoft/TypeScript/issues/37677
Перевести · 29.03.2020 · Private fields are allowed in TypeScript, but private methods are not (likely because the methods proposal took longer to get to Stage 3). In @denoland we have a version of V8 that supports the private methods …
https://stackoverflow.com/questions/8475564
Перевести · by adding to spyOn you remove it from typescript type check. you also need to use array index notation in order to access a private method (sayHello) in the test expect
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