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I am trying to sort an array of object by a property title. This the code snippet that I am running but it does not sort anything. The array is displayed as it is. P.S I looked at previous similar questions. This one for example here suggests and uses the same method I am using.
The javascript:
function sortLibrary() {
// var library is defined, use it in your code
// use console.log(library) to output the sorted library data
console.log("inside sort");
library.sort(function(a,b){return a.title - b.title;});
console.log(library);
}
// tail starts here
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
}
];
sortLibrary();
The html code:
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<h1> Test Page </h1>
<script src="myscript.js"> </script>
</body>
</html>
828
Sort an Array of Objects in JavaScript To sort an array of objects, you use the sort() method and provide a comparison function that determines the order of objects.
Have you tried like this? It is working as expected
library.sort(function(a,b) {return (a.title > b.title) ? 1 : ((b.title > a.title) ? -1 : 0);} );
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
}
];
console.log('before sorting...');
console.log(library);
library.sort(function(a,b) {return (a.title > b.title) ? 1 : ((b.title > a.title) ? -1 : 0);} );
console.log('after sorting...');
console.log(library);Subtraction is for numeric operations. Use a.title.localeCompare(b.title) instead.
function sortLibrary() {
console.log("inside sort");
library.sort(function(a, b) {
return a.title.localeCompare(b.title);
});
console.log(library);
}
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
}
];
sortLibrary();Use the < or > operator when comparing strings in your compare function.
see documentation
2
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