Modern JavaScript implements high level tools for creating and managing classes, still most of those tools rely on low level functions still present and in use in some libraries and legacy code.
Modern JavaScript implements high level tools for creating and managing classes, nevertheless most of those tools rely on low level functions still present and in use in many libraries and legacy code.
In order to understand how `class` and `inheritance` works you will have to recreate a similar behavior by using only the low level functions provided by the language.
In order to understand how `prototypal inheritance` works you will have to recreate a similar behavior by using only the low level functions provided by the language.
You will have `Animal` which will be the equivalent of a base class and will have the following fields:
You will have `Animal` which will an object and will have the following properties:
- `canEat`, `canBreath`, `isAlive`: All booleans, set to true.
- `WhoAmI`: Function that return a string, here it will be `"I'm an animal"`.
- `WhoAmI`: Function that returns a string, here it will be `"I'm an animal"`.
The following objects will inherit from `Animal` and add/override fields as follow:
- `Dog`: add field`canRun` set to `true`.
- `Bird`: add field`canFly` and `makeEggs` set to `true`.
- `Dodo`: override `canFly` and `isAlive` to `false`.
- `Dog`: adds property`canRun` set to `true`.
- `Bird`: adds properties`canFly` and `makesEggs` set to `true`.
- `Dodo`: overrides`canFly` and `isAlive` to `false`.
All of them will override `WhoAmI`, returning `"I'm a [animal name]"`.
> There is many different ways to work on prototypes, we suggest to use `Object.assign` and similar functions, but feel free to experiment other ways to understand the differences.
> There are many different ways to work on prototypes, we suggest to use `Object.assign` and similar functions, but feel free to experiment other ways to understand the differences.
Michele Sessa
1 year ago
committed by