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adapter-concept.ts
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adapter-concept.ts
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// Adapter Concept Sample Code
interface IA {
methodA(): void
}
class ClassA implements IA {
methodA() {
console.log('method A')
}
}
interface IB {
methodB(): void
}
class ClassB implements IB {
methodB() {
console.log('method B')
}
}
class ClassBAdapter implements IA {
// ClassB does not have a methodA, so we can create an adapter
#classB: ClassB
constructor() {
this.#classB = new ClassB()
}
methodA() {
'calls the class b method_b instead'
this.#classB.methodB()
}
}
// The Client
// Before the adapter I need to test the objects class to know which
// method to call.
const ITEMS = [new ClassA(), new ClassB()]
ITEMS.forEach((item) => {
if (item instanceof ClassB) {
item.methodB()
} else {
item.methodA()
}
})
// After creating an adapter for ClassB I can reuse the same method
// signature as ClassA (preferred)
const ADAPTED = [new ClassA(), new ClassBAdapter()]
ADAPTED.forEach((item) => {
item.methodA()
})