import { ICompare } from "@thi.ng/api";
import { compare } from "@thi.ng/compare";

class Foo implements ICompare<Foo> {

    x: number;

    constructor(x: number) {
        this.x = x;
    }

    compare(o: Foo) {
        return compare(this.x, o.x);
    }
}

compare(new Foo(1), new Foo(2));
// -1

import * as cmp from "@thi.ng/compare";

const src = [
    { id: "charlie", age: 66 },
    { id: "bart", age: 42 },
    { id: "alice", age: 23 },
    { id: "dora", age: 11 },
];

// cluster sort by id -> age (default comparators)
[...src].sort(cmp.compareByKeys2("id", "age"));
// [
//   { id: 'alice', age: 23 },
//   { id: 'bart', age: 42 },
//   { id: 'charlie', age: 66 },
//   { id: 'dora', age: 11 }
// ]

// cluster sort by age -> id (default comparators)
[...src].sort(cmp.compareByKeys2("age", "id"));
// [
//   { id: 'dora', age: 11 },
//   { id: 'alice', age: 23 },
//   { id: 'bart', age: 42 },
//   { id: 'charlie', age: 66 }
// ]

// cluster sort by age -> id
// (custom comparator for `age` key)
[...src].sort(cmp.compareByKeys2("age", "id", cmp.compareNumDesc));
// [
//   { id: 'charlie', age: 66 },
//   { id: 'bart', age: 42 },
//   { id: 'alice', age: 23 },
//   { id: 'dora', age: 11 }
// ]

// using `reverse()` comparator for `id`
[...src].sort(cmp.compareByKeys2("age", "id", cmp.compare, cmp.reverse(cmp.compare)));
// [
//   { id: 'dora', age: 11 },
//   { id: 'alice', age: 23 },
//   { id: 'bart', age: 42 },
//   { id: 'charlie', age: 66 }
// ]