How to name variables in javascript

JavaScript variable naming guidelines should follow camelCase naming, avoid special characters and reserved words, and use meaningful names. Additionally, use descriptive suffixes, maintain consistency, and take advantage of your code editor's naming assistants or formatting tools.

JavaScript variable naming guidelines

In JavaScript, variable naming follows the following guidelines:

1. CamelCase nomenclature

Use camelCase nomenclature, the first word should not be capitalized, and the first letter of subsequent words should be capitalized. For example:

<code class="javascript">const firstName = "John";
const lastName = "Doe";
const age = 30;</code>

2. Avoid using special characters and reserved words

Do not use special characters in variable names, such as #, @ or $. Likewise, don't use JavaScript reserved words such as if, while or const.

3. Use meaningful names

Variable names should clearly describe the contents of the variable. Avoid using vague or generic names. For example:

<code class="javascript">// 更好的变量名
const fullName = "John Doe";

// 差的变量名
const name = "John Doe";</code>

4. Use descriptive suffix

For arrays or objects, you can use descriptive suffixes to specify the purpose of the variable. For example:

• namesList (a list of names)
• userDataObject (an object containing user data)

5. Maintain consistency

Maintain consistency in variable naming in the project. For example, if you use camelCase, you should always use camelCase.

6. Using a code editor

Many code editors provide variable naming assistants or formatting tools. These tools can help you create variable names that adhere to best practices.

Example:

<code class="javascript">// 好的命名
const firstName = "John";
const userAge = 30;
const isLoggedIn = true;

// 差的命名
const fName = "John";
const uAge = 30;
const loggedIn = true;</code>

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