Typescript array of different generic types

Question

If I have an array a where each element is an object consisting of two properties first and second, how should I declare `a\'s type su

Answer 1

If you want an array where first will always have the same type, this will do

interface IArrayGeneric {
    first: T;
    second: (arg: T) => string;
}

const a: Array>;

This will ensure that you can't put any object into a that doesn't satisfy the above requirements, but will also constrain T to one specific type you choose.