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:

Live Demo:
See the Pen javascript-object-exercise-10 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Previous: Write a JavaScript program to calculate the area and perimeter of a circle. Create two methods to calculate the area and perimeter. The radius of the circle will be supplied by the user.
Next: Write a JavaScript function to print all the methods in an JavaScript object.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
JavaScript: Tips of the Day
How to remove a specific item from an array?
Find the index of the array element you want to remove using indexOf, and then remove that index with splice.
The splice() method changes the contents of an array by removing existing elements and/or adding new elements.
const array = [2, 5, 9]; console.log(array); const index = array.indexOf(5); if (index > -1) { array.splice(index, 1); } // array = [2, 9] console.log(array);
The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.
For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:
function removeItemOnce(arr, value) { var index = arr.indexOf(value); if (index > -1) { arr.splice(index, 1); } return arr; } function removeItemAll(arr, value) { var i = 0; while (i < arr.length) { if (arr[i] === value) { arr.splice(i, 1); } else { ++i; } } return arr; } //Usage console.log(removeItemOnce([2,5,9,1,5,8,5], 5)) console.log(removeItemAll([2,5,9,1,5,8,5], 5))
Ref: https://bit.ly/2N9nKRp
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework