EN
TypeScript - interface extends keyword
6 points
In TypeScript it is possible to extend interface in following way.
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interface Shape {2
getName() : string;3
}4
5
interface Square extends Shape {6
computePerimeter(a : number, b : number) : number;7
computeArea(a : number, b : number) : number;8
}9
10
class LocalSquare implements Square {11
public getName() : string {12
return 'Square';13
}14
15
public computePerimeter(a : number, b : number) : number {16
return 2 * a + 2 * b;17
}18
19
public computeArea(a : number, b : number) : number {20
return a * b;21
}22
}23
24
let square = new LocalSquare();25
26
console.log(square.getName());27
console.log(square.computePerimeter(2, 3));28
console.log(square.computeArea(2, 3));Output:
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Square2
103
6Run it online here.
Note: Square interface extends Shape interface.