All function bodies are indented by one tab, even if the entire file is wrapped in a closure. All JavaScript in the backoffice needs to be in a namespace and defined in a class. The coding standards below are my own opinion on what can help with the above points, using what I have experienced whilst developing and reviewing other developers JavaScript. Watch 64 Star 1 Fork 17.9k Code. PascalCase is often preferred by C programmers. The web is for everybody, not an elite group of users with a state-of-the-art configuration. If a JavaScript statement does not fit on one line, the best place to break No whitespace at the end of line or on blank lines. Always use the same coding conventions for all your JavaScript Naming and declaration rules for variables and functions. JavaScript code should not be embedded in HTML files unless the code is specific to a single session. “Code refactoring should not be done just because we can.” – Lead Developer Andrew Nacin. If an abbreviation or an acronym occurs at the start of a variable name, it must be written to respect the camelcase naming rules covering the first letter of a variable or class definition. There should be a new line at the end of each file. Code style is about consistency and discipline, and there's no real right or wrong. Case statements are indented within switch blocks. Settings to use for ESLint to ensure coding standards. These deviations are for consistency between the PHP and JavaScript files in the WordPress codebase. Most rules have little impact on the execution of programs. ask: HTML5 attributes can start with data- (data-quantity, data-price). Function contents are consistently indented, including full-file closure wrappers. When a chain of method calls is too long to fit on one line, there must be one call per line, with the first call on a separate line from the object the methods are called on. This document provides the JavaScript coding standards for development. This should be placed right before the Object that contains the class definition. For example: Should you use hyp-hens, camelCase, or Javascript Coding Standard — Clean Code. At the bottom of this page, you will find a wider discussion about naming characters. Create a config file named .eslintrc in the root of your JavaScript project (in the folder that contains all your files). When a conditional is too long to fit on one line, each operand of a logical operator in the boolean expression must appear on its own line, indented one extra level from the opening and closing parentheses. Install ESLint with the command npm install -g eslint (npm is a JavaScript package installer). JavaScript API documentation and comment standards. When a string contains single quotes, they need to be escaped with a backslash (\): The usage of switch statements is generally discouraged, but can be useful when there are a large number of cases – especially when multiple cases can be handled by the same block, or fall-through logic (the default case) can be leveraged. Namespaces front-end-build: Creates and minifies css and JavaScript files less: Compile all root less documents into their CSS counterparts minify: Create minified versions of the given Javascript and CSS files Many parts of the WordPress code structure for JavaScript are inconsistent in their style. No whitespace at the end of line or on blank lines. Hyphens can be mistaken as subtraction attempts. 3. To exclude a specific file region from being processed by JSHint, enclose it in JSHint directive comments: Principles of Writing Consistent, Idiomatic JavaScript. Except as noted below, any line that would exceed this limit must be line-wrapped, as explained in ??. Different editors interpret tabs differently. @lends This tag will allow JSDoc to recognize the extend function from Backbone as a class definition. This page describes the general JavaScript code conventions used by W3Schools. This module saves you (and others!) All code in any code-base should look like a single person typed it, no matter how many people contributed. 2. Javascript code conventions. Use quotes around string values, not around numeric values. Refer to the JavaScript Documentation Standards for more information. The goal is to define guidelines to enforce consistent style and formatting and help developers avoid common pitfalls and mistakes. Put the closing bracket on a new line, without leading spaces. 1. Pull requests 3. Do not add a comma after the last property-value pair. The argument behind defining the style guide is that “ long term value of the software is directly proportional to the quality of codebase ”. ESLint settings. camelCase is used by JavaScript itself, by jQuery, and other JavaScript They typically cover: Coding conventions can be documented rules for teams to follow, or just be your individual coding practice. The use of JavaScript has exploded over time. Object literal notation should be used unless the object requires a specific prototype, in which case the object should be created by calling a constructor function with new. Tabs should be used for indentation. Lines should usually be no longer than 80 characters, and should not exceed 100 (counting tabs as 4 spaces). The legacy JavaScript code in the core doesn't adhere to these guidelines but should be refactored so that it does. This guide serves as the coding standard for all Appcelerator JavaScript code including the Mobile Web platform, Titanium Mobile project templates, KitchenSink, and all other sample code. Mark is the creator of the Bootstrap framework. Having said that, always keep in mind that a library can never be as fast as raw JavaScript (assuming you code correctly). This is wasted time and effort — we should build code based on agreed standards as outlined in this course of articles, not for one browser. Object literal notation, {}, is both the most performant, and also the easiest to read. Code in HTML adds significantly to pageweight with no opportunity for mitigation by caching, minification, and compression. 1. WordPress uses single quotation marks for string declarations. eslint settings to impose Drupal JavaScript coding standards. Coding conventions are style guidelines for programming. You should be in the root directory which contains the package.json file. A constant as defined in these coding guidelines applies only to values which are expected to never change, and is a strategy for developers to communicate intent moreso than it is a technical restriction. Limiting JSHint to a single file can be useful if you are only working on one or two specific files and don’t want to wait for JSHint to process every single file each time it runs. Javascript files MUST follow the Airbnb Javascript style guide. It is provided primarily as an online tool, but there are also command-line adaptations. Exceptions are allowed for iterators, such as the use of i to represent the index in a loop. Larger production WordPress is working to gradually improve this, so the code will be clean and easy to read at a glance. Code refactoring should not be done just because we can. There … Constructors intended for use with new should have a capital first letter (UpperCamelCase). Most web servers (Apache, Unix) are case sensitive about file names: london.jpg cannot be accessed as London.jpg. HTML files should have a .html extension (.htm is allowed). This example would make passwordStrength an allowed global variable within that file: The “true” after passwordStrength means that this global is being defined within this file. WordPress requires PHP 5.6.20 files in WordPress core Core Core is the set of software required to run WordPress. A declaration should use const unless its value will be reassigned, in which case let is appropriate. Use colon plus one space between each property and its value. Each rule starts with a short description followed by several examples. Standards are needed for formatting and styling JavaScript code to maintain the same code consistency as the WordPress standards provide for core PHP, HTML, and CSS code. JSHint is an automated code quality tool, designed to catch errors in your JavaScript code. These are the preferred ways of checking the type of an object: Anywhere Backbone or Underscore are already used, you are encouraged to use Underscore.js‘s type checking methods over jQuery’s. Moved to the in-tree documentation: Found a problem with this page? Crockfords’s Coding Standards for JavaScript This one is the creation of Douglus Crockford, a JavaScript enthusiast. JavaScript best practices. Security Insights Dismiss Join GitHub today. JavaScript code has a column limit of 80 characters. Place the closing bracket on a new line, without JSDoc comments should use the /** multi-line comment opening. It will put you in conflict with many JavaScript library names. This is contrary to the OKFN Coding Standards but matches what’s in use in the current code base. JavaScript Coding Standards The PHP PHP The web scripting language in which WordPress is primarily architected. Examples might be simplified to improve reading and learning. We believe examples are better than long explanations. Lines should usually be no longer than 80 characters, and should not exceed 100 (counting tabs as 4 spaces). projects. JavaScript style guide, linter, and formatter. This text is a brief overview of JerryScript Coding Standards. Coding conventions are not used by computers. Source on GitHub; Report a problem with this content on GitHub; Want to fix the problem yourself? All variables, functions, methods, class names, and comments SHOULD be written in English. – Principles of Writing Consistent, Idiomatic JavaScript. Assignments within the var statement should be listed on individual lines, while declarations can be grouped on a single line. Backbone’s extend calls should be formatted as follows:. "Fiat"]; var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; document.getElementById("demo").innerHTML =, W3Schools is optimized for learning and training. Some whitespace rules differ, for consistency with the WordPress PHP coding standards. Files which add to, or modify, the wp object must safely access the global to avoid overwriting previously set properties: Variable and function names should be full words, using camel case with a lowercase first letter. It is very important for the programmers to maintain the coding standards otherwise the code will be rejected during code review. For code written using ES2015 or newer, const and let should always be used in place of var. under_scores in variable names? Once Node.js is installed, open a command line window and navigate to the directory where you checked out a copy of the WordPress SVN repository (use cd ~/directoryname. The correct install file for your operating system will be downloaded. If you use a mix of upper and lower case, you have to be extremely While the coding standards are important, refactoring older .js files simply to conform to the standards is not an urgent issue. Backbone and Underscore may be accessed directly at any time. JavaScript libraries, such as jQuery and Mootools, can save you an enormous amount of time when coding -- especially with AJAX operations. Raw JavaScript Can Always Be Quicker Than Using a Library . Object declarations can be made on a single line if they are short (remember the line length guidelines). As a web developer who has concentrated on back-end coding in C# and front-end look and feel via HTML and CSS, my skills in JavaScript evolved over time instead of by conscious effort. All code in any code-base should look like a single person typed it, no matter how many people contributed. Many of these guidelines are … W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. Exceptions: goog.module, goog.require and goog.requireType statements (see ?? Do not start names with a $ sign. At W3schools we use camelCase for identifier names (variables and functions). These rules encourage liberal spacing for improved developer readability. Next, type npm install into the command line window. Even if the entire file is contained in a closure (i.e., an immediately invoked function), the contents of that function should be indented by one tab: if, else, for, while, and try blocks should always use braces, and always go on multiple lines. All JavaScript documents must use two spaces for indentation. Indentation with tabs. Both JSHint and Grunt are programs written in Node.js. For variable assignment, this means writing the abbreviation entirely as lowercase. Do not end a complex statement with a semicolon. time in three ways: They typically cover: Naming and declaration rules for variables and functions. General rules. This is a “soft” rule, but long lines generally indicate unreadable or disorganized code. The opening brace should be on the same line as the function definition, the conditional, or the loop. Object properties should be accessed via dot notation, unless the key is a variable or a string that would not be a valid identifier: When iterating over a large collection using a for loop, it is recommended to store the loop’s max value as a variable rather than re-computing the maximum every time: Learn and understand Underscore’s collection and array methods. 4. if… Always use the same naming convention for all your code. You should now be able to type npm run grunt jshint to have Grunt check all the WordPress JavaScript files for syntax and logic errors. Always end an object definition with a semicolon. “When in doubt, space it out.” These rules encourage liberal spacing for improved developer readability. Use one space before the opening bracket. There must be a single space between the comment token (//) and the comment text. Rohan Shakya. When a statement is too long to fit on one line, line breaks must occur after an operator. Objects and functions that occupy more than a handful of lines should be assigned outside of the var statement, to avoid over-indentation. And this would only check the “password-strength-meter.js” file within the unit tests directory: npm run grunt jshint:tests --file=password-strength-meter.js. These functions, including _.each, _.map, and _.reduce, allow for efficient, readable transformations of large data sets. Top ↑ Backbone classes # Backbone classes. Use RFC 2119 to interpret the “must,” “must not,” “required,” “shall,” “shall not,” “should,” “should not,” “recommended,” “may,” and “optional” keywords. JavaScript coding standards for improving the quality of your code. JavaScript coding standards are no different. JerryScript Coding Standards. databases. Underscores are often used in PHP documentation. necessary): A consequence of using "untidy" HTML styles, might result in JavaScript errors. JavaScript Standard Style Sponsored by English • Español (Latinoamérica) • Français • Bahasa Indonesia • Italiano (Italian) • 日本語 (Japanese) • 한국어 (Korean) • Português (Brasil) • 简体中文 (Simplified Chinese) • 繁體中文 (Taiwanese Mandarin). Coding style must follow the idiomatic.js style but with the following exceptions. Standards are needed for formatting and styling JavaScript code to maintain the same code consistency as the WordPress standards provide for core PHP, HTML, and CSS code. Use spaces liberally throughout your code. Many programmers prefer to use underscores (date_of_birth), especially in SQL Such variables must use the SCREAMING_SNAKE_CASE convention. All JavaScript in the Umbraco core should adhere to these guidelines. Any violation to these standards is allowed if it enhances readability. If the method changes the context, an extra level of indentation must be used. The minification process creates a file that is optimized for browsers to read and process. Javascript Coding Standards Overview Javascript Platform Roadmap Standards References: Other Resources: ECMA Script 5 Development Platform Javascript IDE Web Container Logging MVC Package Layout Components Controllers Delegates Events Callbacks Models Data Models Request Models Services Common Data Service Implementing a Data Service Views JavaScript Coding Conventions. JavaScript coding standards and guidelines. Always end a simple statement with a semicolon. Actions Projects 0. ES module import and … Coding Style. Backbone, jQuery, Underscore, and the global wp object are all registered as allowed globals in the root .jshintrc file. Always include extra spaces around elements and arguments: Use them. errors can break your web site. JSHint is run using a tool called Grunt. jQuery’s 100-character hard line limit is encouraged, but not strictly enforced. Here are some of my tips for coding standards. ... is a static code analysis tool used in software development for checking if JavaScript source code complies with coding rules. To specify a single file for JSHint to check, add --file=filename.js to the end of the command. Unlike var, it is not necessary to declare all variables at the top of a function. All @wordpress/element Components, including stateless function components, should be named using Class Definition naming rules, both for consistency and to reflect the fact that a component may need to be transitioned from a function to a class without breaking compatibility. This document describes Javascript coding standards for Phabricator and Javelin. Capitalize the first letter of the comment, and include a period at the end when writing full sentences. CSS uses hyphens in property-names (font-size). Whitespace can easily accumulate at the end of a line – avoid this, as trailing whitespace is caught as an error in JSHint. 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