Nodejs Array Sort sortByKeysortByKey(key, dsc)

Method Source Code

Array.prototype.sortByKey = function sortByKey(key, dsc) {
  return this.sort(function(a, b) {
      var x = a[key]; 
      var y = b[key];
      if (dsc ==='dsc') {
        return (x === undefined && y === undefined ? 0 : (x < y) || x === undefined ? 1 : ((x > y) || y === undefined ? -1 : 0));
      }/*from   w  w  w.j av a  2  s. c o  m*/
      return (x === undefined && y === undefined ? 0 : (x < y) || x === undefined ? -1 : ((x > y) || y === undefined ? 1 : 0)); 
  });
};

module.exports = {
  'sortByKey': Array.prototype.sortByKey
};

Related

1. sortBy(p, type)

   Array.prototype.sortBy = function(p, type) {
     if(type == undefined) type = "asc";
     if(type == "desc"){
       return this.slice(0).sort(function(a,b) {
         return (a[p] < b[p]) ? 1 : (a[p] > b[p]) ? -1 : 0;
       });        
     } else {
       return this.slice(0).sort(function(a,b) {
         return (a[p] > b[p]) ? 1 : (a[p] < b[p]) ? -1 : 0;
   ...
   

2. sortByDesc(f)

   Array.prototype.sortByDesc = function (f) {
       return this.sort(function (a, b) {
           if (a[f] < b[f])
               return 1;
           if (a[f] > b[f])
               return -1;
           return 0;
       });
   };
   ...
   

3. sortByFrequency()

   Array.prototype.sortByFrequency = function () {
     var freq = {};
     this.map(function(e, i, a){
       if(e in freq){
         freq[e]++;
       } else {
         freq[e] = 1;
     });
   ...
   

4. sortByID()

   var library = [ 
          title:  'The Road Ahead',
          author: 'Bill Gates',
          libraryID: 1254
      },
          title: 'Walter Isaacson',
          author: 'Steve Jobs',
   ...
   

5. sortByID(argument)

   'use strict';
   Array.prototype.sortByID = function(argument){
     this.sort(function(x,y){
       return x.libraryID > y.libraryID;
     });
   };
   var library = [ 
          title:  'The Road Ahead',
   ...
   

6. sortByNumber()

   Array.prototype.sortByNumber = function() {
    return this.sort(function(a, b) { return a - b; }); 
   

7. sortDescending()

   function getLargestPalindrome() {
     products = fillMultiples().sortDescending();
     for (i = 0; i < products.length; i++) {
       if (products[i].toString().isPalindrome()) {
         return products[i];
   function fillMultiples() {
   ...
   

8. sortNumber(a)

   Array.prototype.sortNumber = function(a) {
     if (a == true) {
       return this.sort(function(d, c) {
         return d - c
       }).reverse()
     } else {
       return this.sort(function(d, c) {
         return d - c
       })
   ...
   

9. sortObject(field)

   Array.prototype.sortObject = function(field) {
     if (typeof this[0][field] === 'undefined') return this;
     var len = this.length,
       i,
       j,
       flag,
       next,
       temp;
     for (i = 1; i < len; i++) {
   ...