array of interface in typescript 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: create method in interface for set TS

running: someTask, arg: test

Example 3: interface ts one valu

// use type instead interface
type StringOrNull = string | null;