Kupanua Interfaces katika OOP katika TypeScript

Interfaces katika TypeScript zinaweza kurithi kutoka kwa kila mmoja. Mwingiliano kama huo unaitwa kupanua interfaces. Hebu tuangalie kwa mfano. Hebu tuseme tuna interface ISize:

interface ISize {
	height: number;
	width: number;
}

Tufanye interface IStyle, ambayo itapanua ISize:

interface IStyle extends ISize {
	color: string;
}

Sasa hebu tuunde darasa Figure, linalotekeleza interface IStyle. Darasa letu litahitaji kutekeleza sifa ya interface yenyewe, na ya mzazi wake. Tufanye hivi:

class Figure implements IStyle {
	height: number;
	width: number;
	color: string;
	
	constructor(height: number, width: number, color: string) {
		this.height = height;
		this.width  = width;
		this.color  = color;
	}
}

Hebu tuangalie utendaji:

let fig = new Figure(130, 200, 'green');
console.log(fig);

Unda interface IProgrammer iliyo na sifa salary na language. Acha interface hii irithi IUser iliyo na sifa name, birthday.

Fanya darasa Employee ambalo linatekeleza IProgrammer.