在TypeScript中循环遍历自定义对象数组

Question

I started playing a little bit with TypeScript. I have created two classes (Student and Listview). I am trying to loop over the array with the student objects I created but somehow it doesn't work.

class Student {
    fullName: string;
    constructor(public firstName, public middleInitial, public lastName) {
        this.fullName = firstName + " " + middleInitial + " " + lastName;
    }
}

class Listview {
    items: Array<Student>;
    constructor(public item_list: Array<Student>) {}

    log(): void {
        var items = this.items;
        for(var i=0; i<items.length; i++) {
          console.log(items[i]);
        }
    }

}

var list = new Listview(
    [new Student("Jane", "M.", "User"),
    new Student("Hans", "M.", "Muster"),
    new Student("Fritz", "B.", "Muster")]
);
list.log();

I get this warning in the console:

console error

How do I need to access the array to read the properties of each student object?

Greetings Orkun

Answer 1

Your ListView should look like this, in order to correctly initialize items :

class Listview {
    constructor(public items: Array<Student>) {}

    log(): void {
        var items = this.items;
        for(var i=0; i<items.length; i++) {
          console.log(items[i]);
        }
    }
}