Home > Web Front-end > JS Tutorial > Do Quoted and Unquoted Object Keys in JavaScript Make a Difference?

Do Quoted and Unquoted Object Keys in JavaScript Make a Difference?

Susan Sarandon
Release: 2024-12-11 02:20:09
Original
524 people have browsed it

Do Quoted and Unquoted Object Keys in JavaScript Make a Difference?

Object Keys with and Without Quotes: A Difference in Appearance

While working with JavaScript objects, you may encounter object keys with or without quotes. It's a common question whether there's any difference between:

obj = {'foo': 'bar'}; // With quotes
Copy after login

and

obj = {foo: 'bar'}; // Without quotes
Copy after login

The Answer: No Significant Difference

In most cases, there is no significant difference between keys with and without quotes. JavaScript allows unquoted keys as long as they are valid JavaScript identifiers.

Exceptions: Using Special Characters in Keys

However, if you need to use special characters in your keys, such as dashes (-), you must use quotes.

JSON Requirement

It's important to note that the JSON data exchange format requires double quotes around keys. While this doesn't affect the functionality of JavaScript objects, it's a consideration if you plan to exchange data with a system that uses JSON.

Example

Let's consider the following code:

var obj1 = {'foo': 'bar', 'baz-1': 'qux'};
var obj2 = {foo: 'bar', 'baz-1': 'qux'};
Copy after login

Both obj1 and obj2 will create objects with the same keys and values. However, if you try to convert obj1 to a JSON string, you'll encounter an error due to the unquoted key with a dash.

In conclusion, while there's typically no functional difference between keys with and without quotes, it's recommended to use quotes for keys that include special characters or when dealing with JSON data exchange.

The above is the detailed content of Do Quoted and Unquoted Object Keys in JavaScript Make a Difference?. For more information, please follow other related articles on the PHP Chinese website!

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template