Learn TypeScript 3 by Building Web Applications

Fields, methods, visibility, and constructors

Here's how you can define fields, methods, visibility, and constructors in your TypeScript classes:

class ColoredCar { 
    private _color: string; 
    private static DEFAULT_COLOR = "Red"; 

    constructor(color: string) { 
        this._color = color; 
    } 

    displayColor() { 
        console.log(`Color of this car: ${this.color}`); 
    } 

    public get color(): string { 
        return this._color; 
    } 

    public set color(color: string) { 
        this._color = color 
    } 

    private resetColor() { 
        this._color = ColoredCar.DEFAULT_COLOR; 
    } 
} 

As you saw earlier, methods are not prefixed by the function keyword.

TypeScript provides a shorthand for defining properties through the constructor function. For example, the constructor(private foo: string) { } notation may ...