typescript interface with different number of generic code example

Example 1: extend generics in functions typescript

interface Lengthwise {
    length: number;
}

function loggingIdentity<T extends Lengthwise>(arg: T): T {
    console.log(arg.length);  // Now we know it has a .length property, so no more error
    return arg;
}

Example 2: typescript generic type interface

interface IProcessor<T> 
{ 
    result:T;
    process(a: T, b: T) => T;
}