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generics.ts
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generics.ts
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class ArrayOfNumbers {
constructor(public collection: number[]) {}
get(index: number): number {
return this.collection[index];
}
}
class ArrayOfStrings {
constructor(public collection: string[]) {}
get(index: number): string {
return this.collection[index];
}
}
class ArrayOfAnything<T> {
constructor(public collection: T[]) {}
get(index: number): T {
return this.collection[index];
}
}
const arr = new ArrayOfAnything<string>(["a", "b"]);
const arrInferred = new ArrayOfAnything(["a", "b"]);
// Example of generics with functions
function printAnything<T>(arr: T[]): void {
arr.forEach((elem: T) => console.log(elem));
}
printAnything<string>(["a", "b"]);
// Generic constraints
class Car {}
class House {
print() {
console.log("I am a house");
}
}
interface Printable {
print(): void;
}
function printHousesOrCars<T extends Printable>(arr: T[]): void {
arr.forEach((elem) => elem.print());
}
printHousesOrCars([new House()]);