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JavaScript: Sort the specified array of objects by title value

JavaScript Array: Exercise-25 with Solution

Write a JavaScript function to sort the following array of objects by title value.

Sample object:

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

Pictorial Presentation:

JavaScript: Sort the specified array of objects by title value

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Write a JavaScript function to sort an lowing array of objects by title value.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

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

function compare_to_sort(x,y) 
 {
  if (x.title < y.title)
    return -1;
  if (x.title > y.title)
    return 1;
  return 0;
 }

console.log(library.sort(compare_to_sort));

Sample Output:

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

Flowchart:

Flowchart: JavaScript: Sort the specified array of objects by title value

ES6 Version:

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

function compare_to_sort(x,y) 
 {
  if (x.title < y.title)
    return -1;
  if (x.title > y.title)
    return 1;
  return 0;
 }

console.log(library.sort(compare_to_sort));

Live Demo:

See the Pen JavaScript - Sort the specified array of objects by title value - array-ex- 25 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript function to remove. 'null', '0', '""', 'false', 'undefined' and 'NaN' values from an array.
Next: Write a JavaScript program to find a pair of elements (indices of the two numbers) from an given array whose sum equals a specific target number.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04