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JavaScript Exercises

JavaScript: Sort an array of JavaScript objects

JavaScript Object: Exercise-10 with Solution

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: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript program to sort an array of JS objects</title>
</head>
<body>

</body>
</html>

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);

Sample 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:

Flowchart: JavaScript - Sort an array of JavaScript objects.

Live Demo:

See the Pen javascript-object-exercise-10 by w3resource (@w3resource) on CodePen.


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