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