Version 1.8 of TypeScript caught my attention because it now supports F-Bounded Polymorphism. Can you help me understand what this feature is in simple terms and how it can be beneficial? I assume that its early inclusion signifies its significance.
Version 1.8 of TypeScript caught my attention because it now supports F-Bounded Polymorphism. Can you help me understand what this feature is in simple terms and how it can be beneficial? I assume that its early inclusion signifies its significance.
Essentially, this concept implies that you have a set of generics referenced by a function, where one type within the set can point to another type. This helps establish a connection between the two generic types.
function someFunction <T, U> (t: T, u: U): T {
return t;
}
const apple = someFunction(new Apple(), new Banana());
Celebration time!
Now, with bounded generics, they can reference each other to specify the boundaries of their relationship:
function someFunction <T extends U, U> (t: T, u: U): T {
return t;
}
const pineapple = someFunction(new Pineapple(), new Fruit());
const monkey = someFunction(new Monkey(), new Animal());
const CRASH = someFunction(new Tiger(), new Lion()); // *CRASH!*
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