This function resolves the problem with different values in a function or class.

Example: We have a function with different parameters and descriptions like:

interface MyExample1 {
 count: number;
 cost: number;
}

interface IMyExample2{
 items: string[];
 cost: number
}

// The simple function returned 

function Sum(data: MyExample1|IMyExample2) {
 return cost * (isItType<MyExample1>(data, "count") ? count : items.lenght);
}

The function isItType help understand with the exact interface we are using at this time.