Sort An Array Of Objects In JavaScript

Sort an Array of Objects in JavaScript

In this post, we will give you information about Sort an Array of Objects in JavaScript . Here we will give you detail about Sort an Array of Objects in JavaScript And how to use it also give you a demo for it if it is necessary.

Suppose you have a JavaScript array containing Star Trek: The Next Generation characters:

const characters = [
  { firstName: 'Jean-Luc', lastName: 'Picard', rank: 'Captain', age: 59 },
  { firstName: 'Will', lastName: 'Riker', rank: 'Commander', age: 29 },
  { firstName: 'Geordi', lastName: 'La Forge', rank: 'Lieutenant', age: 29 }
];

How do you sort this array by different properties?

Sorting By `age`

JavaScript’s built-in Array#sort() function optionally takes a callback parameter that compares two elements in the array.

The callback function is called compareFunction(). If compareFunction(a, b) returns a value that is < 0, JavaScript considers a to be less than b.
And if compareFunction(a, b) returns a value that is > 0, JavaScript considers b to be greater than a. That means it is easy to sort by a numeric property like age. If a.age - b.age < 0, that means b is older than a.

const characters = [
  { firstName: 'Jean-Luc', lastName: 'Picard', rank: 'Captain', age: 59 },
  { firstName: 'Will', lastName: 'Riker', rank: 'Commander', age: 29 },
  { firstName: 'Geordi', lastName: 'La Forge', rank: 'Lieutenant', age: 29 }
];

characters.sort((a, b) => a.age - b.age);

// Riker, La Forge, Picard
characters;

Sorting by `lastName`

Sorting by a string property like lastName is also easy, because
JavaScript’s < and > properties can handle strings. To sort
by a string property, your compareFunction() can compare the
two strings using <:

const characters = [
  { firstName: 'Jean-Luc', lastName: 'Picard', rank: 'Captain', age: 59 },
  { firstName: 'Will', lastName: 'Riker', rank: 'Commander', age: 29 },
  { firstName: 'Geordi', lastName: 'La Forge', rank: 'Lieutenant', age: 29 }
];

characters.sort((a, b) => {
  if (a === b) {
    return 0;
  }
  return a.lastName < b.lastName ? -1 : 1;
});

// La Forge, Picard, Riker
characters;

Sorting by `rank`

Sorting by rank is a bit trickier because rank isn’t necessarily
in alphabetical order. JavaScript doesn’t know that ‘Captain’ is
a higher rank than ‘Lieutenant’.

To sort by a custom ordering, you should define a map from
rank to a numeric value to make for easier comparison.

const characters = [
  { firstName: 'Jean-Luc', lastName: 'Picard', rank: 'Captain', age: 59 },
  { firstName: 'Will', lastName: 'Riker', rank: 'Commander', age: 29 },
  { firstName: 'Geordi', lastName: 'La Forge', rank: 'Lieutenant', age: 29 }
];

const rankOrder = new Map([
  ['Captain', 1],
  ['Commander', 2],
  ['Lieutenant', 3]
]);

characters.sort((a, b) => {
  return rankOrder.get(a.rank) - rankOrder.get(b.rank);
});

// Picard, Riker, La Forge
characters;

JavaScript Fundamentals for Sort an Array of Objects in JavaScript

JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.

Here are some of the fundamentals of JavaScript:

Variables: Variables are used to store data. They are declared using the var keyword.
Data types: JavaScript has a variety of data types, including strings, numbers, booleans, objects, and arrays.
Operators: Operators are used to perform operations on data.
Control flow statements: Control flow statements allow you to control the order in which your code is executed.
Functions: Functions are blocks of code that can be reused.
Objects: Objects are used to store data in key-value pairs.
Arrays: Arrays are used to store data in a sequential order.
Events and event handlers: Events are notifications that are sent by the browser when something happens, such as when the user clicks on an element or moves the mouse over an element. Event handlers are functions that are called in response to an event.
DOM manipulation: The Document Object Model (DOM) is a tree-like structure that represents the elements of a web page. JavaScript can be used to manipulate the DOM to change the appearance or behavior of a web page.