JavaScript: Sort an array of JavaScript objects

JavaScript Object: Exercise-10 with Solution

Sort Object Array

Write a JavaScript program to sort an array of JavaScript objects.

Sample Object:

var library = [ 
   {
       title:  'The Road Ahead',
       author: 'Bill Gates',
       libraryID: 1254
   },
   {
       title: 'Walter Isaacson',
       author: 'Steve Jobs',
       libraryID: 4264
   },
   {
       title: 'Mockingjay: The Final Book of The Hunger Games',
       author: 'Suzanne Collins',
       libraryID: 3245
   }];

Expected Output:

[[object Object] {
  author: "Walter Isaacson",
  libraryID: 4264,
  title: "Steve Jobs"
}, [object Object] {
  author: "Suzanne Collins",
  libraryID: 3245,
  title: "Mockingjay: The Final Book of The Hunger Games"
}, [object Object] {
  author: "The Road Ahead",
  libraryID: 1254,
  title: "Bill Gates"
}]

Sample Solution:

JavaScript Code:

var library = [ 
   {
       title: 'Bill Gates',
       author: 'The Road Ahead',
       libraryID: 1254
   },
   {
       title: 'Steve Jobs',
       author: 'Walter Isaacson',
       libraryID: 4264
   },
   {
       title: 'Mockingjay: The Final Book of The Hunger Games',
       author: 'Suzanne Collins',
       libraryID: 3245
   }];

var sort_by = function(field_name, reverse, initial){

   var key = initial ?
       function(x)
             {
               return initial(x[field_name]);
             } :
       function(x) 
             {
               return x[field_name];
             };

   reverse = !reverse ? 1 : -1;

   return function (x, y) {
       return x = key(x), y = key(y), reverse * ((x > y) - (y > x));
     } ;
};


var newobj = library.sort(sort_by('libraryID', true, parseInt));

console.log(newobj);

Output:

[{"title":"Steve Jobs","author":"Walter Isaacson","libraryID":4264},{"title":"Mockingjay: The Final Book of The Hunger Games","author":"Suzanne Collins","libraryID":3245},{"title":"Bill Gates","author":"The Road Ahead","libraryID":1254}]

Flowchart:

Live Demo:

For more Practice: Solve these Related Problems:

• Write a JavaScript function that sorts an array of objects by a string property in alphabetical order.
• Write a JavaScript function that sorts an array of objects by a numeric property in descending order.
• Write a JavaScript function that performs multi-level sorting on an array of objects using primary and secondary keys.
• Write a JavaScript function that uses localeCompare() to sort an array of objects by a string property case-insensitively.

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