DesignPattern/TypeScript.html at master · akshaytilekar7/DesignPattern · GitHub

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<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <div>
        <h3>
            Intersection Types
        </h3>
        <ul>
            <li>combinations of two or more types, which are really useful for objects and parameters that must be implemented in more than one interface.</li>

        </ul>
        <p>
            interface Animal {
            kind: string;
            }

            interface Person {
            firstName: string;
            lastName: string;
            age: number;
            }

            interface Employee {
            employeeCode: string;
            }

            <b>let employee: Animal & Person & Employee = {</b>
            kind: 'human',
            firstName: 'Jane',
            lastName: 'Smith',
            age: 20,
            employeeCode: '123'
            }
        </p>
        <b> employee object has all the properties of Animal , Person , and Employee </b>
    </div>
    <div>
        <h3>
            Union Types
        </h3>
        <ul>
            <li>Create a new type that lets us create objects that have some/all of the properties of each type</li>
        </ul>
        <p>
                interface Animal {
                kind: string;
                }

                interface Person {
                firstName: string;
                lastName: string;
                age: number;
                }
                interface Employee {
                employeeCode: string;
                }
                <b>let employee: Animal | Person | Employee = {</b>
                kind: 'human',
                firstName: 'Jane',
                lastName: 'Smith',
                age: 20
                }
        </p>
        <b> employee object of the Animal | Person | Employee type which means that it can have some of the properties of the Animal, Person, or Employee interfaces.</b>
        <b>Not all of them have to be included, but if they’re included, then the type has to match the ones in the interface</b>

    </div>

</body>
</html>