typescript interface property index code example

Example 1: typescript class implements interface

interface Task{
    name: String; //property
    run(arg: any):void; //method
}

class MyTask implements Task{
    name: String;
    constructor(name: String) {
        this.name = name;
    }
	run(arg: any): void {
        console.log(`running: ${this.name}, arg: ${arg}`);
    }
}

let myTask: Task = new MyTask('someTask');
myTask.run("test");

Example 2: indexable type in ts

//Indexable type Typescript 
interface ListItem {
  [prop: string ] : string | number ;
}

const List: ListItem = {
  name: "joyous jackal" ;
  email: "[email protected]";
  age: 21 ;
}