I'm trying to understand how the code below will create an object that contains 2 functions. I haven't been able to locate any documentation on this specific pattern.
interface FooContext {
bar(a: A, b: B[]): boolean;
baz(a: A, b: B[]): boolean;
}
If I have correctly interpreted your query, here are a few illustrations showcasing how an interface can translate into tangible objects:
interface FooContext<X, Y> {
qux(x: X, y: Y[]): boolean;
quux(x: X, y: Y[]): boolean;
}
const demo1: FooContext<number, string> = {
qux(x, y) {return false},
quux(x, y) {return true}
}
class Demo2 implements FooContext<string, number> {
public qux(x: string, y: number[]) {return false};
public quux(x: string, y: number[]) {return true}
}
const demo2: FooContext<string, number> = new Demo2();
//interface defining a function-object
interface FunctionInterface {
(): boolean;
}
const demo3: FunctionInterface = () => true;
An interface has the capability to depict various types of objects, whether it be an instance of a class or a basic object itself. It's important to note that arrays, functions, classes, and similar constructs are all treated as objects in JavaScript and can also be defined using an interface.
The FooContext interface you have created has defined two methods: bar and baz. These methods each require specific parameters - A for the first parameter and B[] for the second parameter, both returning a value of type boolean.
Any object that implements these methods with the exact same signatures will be considered compliant with the FooContext interface.
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