typescript.md

Generics

function insertAtBeginning<T>(array: T[], value: T) {
    const newArray = [...array, value];
    return newArray;
}

const numberArray = insertAtBeginning([1, 2, 3], 0);
// numberArray[0].split('');

const stringArray = insertAtBeginning(['a', 'b', 'c'], 'd');

Classes

• Blueprints for objects

Interfaces

• Only exist in TypeScript and not in JavaScript
• Same as type alias but with a extra feature
• Interfaces can be implemented by classes
• Angular has some interfaces that force you to implement certain methods in classes like OnInit
• I think interfaces are like Abstract classes in C++