How can you arrange a List of Objects by property in Angular?

When working with Java, the Comparable interface can be utilized to sort Objects by specific fields. As shown in the example below, we are sorting Fruit objects based on their quantity.

public class Fruit implements Comparable<Fruit> {

    private String fruitName;
    private String fruitDesc;
    private int quantity;

    public Fruit(String fruitName, String fruitDesc, int quantity) {
        this.fruitName = fruitName;
        this.fruitDesc = fruitDesc;
        this.quantity = quantity;
    }

    // Getters and Setters...

    public int compareTo(Fruit compareFruit) {
        int compareQuantity = ((Fruit) compareFruit).getQuantity(); 
        return this.quantity - compareQuantity;
    }   
}

Now, I am curious to find out if a similar sorting implementation can be achieved in Angular (Typescript) as well.

export class Fruit {
    fruitName: string;
    fruitDesc: string;
    quantity: number;

    constructor() {}
}

Answer №1

In TypeScript, the concept of comparing fruits is akin to Java, however, there is no requirement to use interfaces. If you wish for a fruit to be comparable, simply implement the necessary method. Unlike Java, the compiler does not perform checks on the structure and the comparison will work at run time:

compareTo(compareFruit: Fruit): int {
    return this.quantity - compareFruit.quantity;
}

Similar to Java, sorting an array in TypeScript involves using the sort method of the collection. Just like in Java, a comparator can be passed as an argument to order elements. Below is an example illustrating this:

let fruits = [];
fruits.push(new Fruit(...));
fruits.push(new Fruit(...));
fruits.push(new Fruit(...));
fruits.push(new Fruit(...));

fruits.sort((fruitA, fruitB) => fruitB.quantity - fruitA.quantity);

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