js & sort object keys All In One

js & sort object keys All In One

const months = ['3', '2', '1'];
console.log(months);
months.sort();
console.log(months);

/*
Array ["3", "2", "1"]
Array ["1", "2", "3"]
*/

"use strict";

/**
 * 
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2022-02-24
 * 
 * @description js & sort object keys All In One
 * @augments 
 * @example 
 * @link https://www.cnblogs.com/xgqfrms/p/15931874.html
 * 
 */

const log = console.log;

const obj = {
    a: 3,
    b: 1,
    c: 2,
};

// Object.entries(obj)
[
    [
        "a",
        3
    ],
    [
        "b",
        1
    ],
    [
        "c",
        2
    ]
];
const arr = Object.entries(obj)

for (const [k, v] of arr) {
    console.log('k, v =', k, v);
}

// desc
arr.sort((a, b) => a[1] - b[1] > 0 ? 1 : -1);


// asc
arr.sort((a, b) => a[1] - b[1] > 0 ? -1 : 1);

// sort object keys
const sortKeys = arr.sort((a, b) => a[1] - b[1] > 0 ? -1 : 1).map(obj => obj[0]);
// ['a', 'c', 'b']


log('sortKeys', sortKeys);

demo

refs

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort

https://en.wikipedia.org/wiki/In-place_algorithm

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