In the past, WordPress core made heavier use of global variables. 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. There must be a single space between the comment token (//) and the comment text. Multiple globals can be comma-separated. JavaScript coding standards. Indentation and line breaks add readability to complex statements. ... is a static code analysis tool used in software development for checking if JavaScript source code complies with coding rules. 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. Coding conventions are style guidelines for programming. While the coding standards are important, refactoring older .js files simply to conform to the standards is not an urgent issue. This file defines which errors JSHint should flag if it finds them within the WordPress source code. You should also read the next chapter "Best Practices", and learn how to avoid coding pitfalls. The WordPress JavaScript Coding Standards are adapted from the jQuery JavaScript Style Guide. Pull requests 3. The minification process creates a file that is optimized for browsers to read and process. JavaScript References. rules. Indentation is two spaces. When an object declaration is too long to fit on one line, there must be one property per line. Use spaces liberally throughout your code. Coding Style. JavaScript Coding Conventions. These deviations are for consistency between the PHP and JavaScript files in the WordPress codebase. JavaScript coding standards are no different. The configuration options used for JSHint are stored within a .jshintrc title=”WordPress JSHint file in svn trunk” in the WordPress SVN repository. For class definitions, its initial letter should be capitalized. "Fiat"]; var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; document.getElementById("demo").innerHTML =, W3Schools is optimized for learning and training. Both JSHint and Grunt are programs written in Node.js. JavaScript files should have a .js extension. little impact on the execution of programs. This should be placed right before the Object that contains the class definition. No whitespace at the end of line or on blank lines. This is a question programmers often discuss. If you move from a case insensitive, to a case sensitive server, even small Always use the same naming convention for all your code. Do not start names with a $ sign. 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. Always use the same coding conventions for all your JavaScript General rules. Next, type npm install into the command line window. 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. 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. Naming and declaration rules for variables and functions. Having said that, always keep in mind that a library can never be as fast as raw JavaScript (assuming you code correctly). JavaScript Coding Standards Version: 1.0 4/6/2015. Refer to the JavaScript Documentation Standards for more information. Source on GitHub; Report a problem with this content on GitHub; Want to fix the problem yourself? 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 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. They usually make their own coding standards and guidelines depending on what suits their organization best and based on the types of software they develop. Backbone, jQuery, Underscore, and the global wp object are all registered as allowed globals in the root .jshintrc file. Acronyms must be written with each of its composing letters capitalized. Capitalize the first letter of the comment, and include a period at the end when writing full sentences. 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. Expand full source codeCollapse full source code. HTML, CSS (Sass), Twig & Smarty code conventions. consistent. Programming practices and principles; Coding conventions secure quality: Improves code readability; Make code maintenance easier Each rule starts with a short description followed by several examples. eslint settings to impose Drupal JavaScript coding standards. It is not recommended to return a value from within a switch statement: use the case blocks to set values, then return those values at the end. Some whitespace rules differ, for consistency with the WordPress PHP coding standards. Except as noted below, any line that would exceed this limit must be line-wrapped, as explained in ??. Most rules have Lines should usually be no longer than 80 characters, and should not exceed 100 (counting tabs as 4 spaces). In almost all cases, a constant should be defined in the top-most scope of a file. For example: Should you use hyp-hens, camelCase, or JSHint is an automated code quality tool, designed to catch errors in your JavaScript code. Other web servers (Microsoft, IIS) are not case sensitive: london.jpg can be accessed as London.jpg or london.jpg. Overview. JavaScript API documentation and comment standards. All function bodies are indented by one tab, even if the entire file is wrapped in a closure. This document describes Javascript coding standards for Phabricator and Javelin. To only check core code, type npm run grunt jshint:core; to only check unit test .js files, type npm run grunt jshint:tests. For code written using ES2015 or newer, const and let should always be used in place of var. If you use a mix of upper and lower case, you have to be extremely it, is after an operator or a comma. The argument behind defining the style guide is that “ long term value of the software is directly proportional to the quality of codebase ”. They typically cover: Coding conventions can be documented rules for teams to follow, or just be your individual coding practice. Developers writing JavaScript and jQuery code for Magento must adhere to these guidelines and follow the standards listed in this document. Create a config file named .eslintrc in the root of your JavaScript project (in the folder that contains all your files). Use simple syntax for loading external scripts (the type attribute is not JPL have been developing software for most of unmanned missions in the field of deep space and other planets exploration. This is contrary to the OKFN Coding Standards but matches what’s in use in the current code base. Actions Projects 0. Our code must be as clean and easy to read as possible. Many programmers prefer to use underscores (date_of_birth), especially in SQL JavaScript coding standards and guidelines. NOTICE OF CONFIDENTIALITY . Never rely on Automatic Semicolon Insertion (ASI). Creating arrays in JavaScript should be done using the shorthand [] constructor rather than the new Array() notation. This is an area where this standard differs from the WordPress PHP coding standards. Raw JavaScript Can Always Be Quicker Than Using a Library . To specify a single file for JSHint to check, add --file=filename.js to the end of the command. For code in development, readability should be preferred. databases. Each function should begin with a single comma-delimited var statement that declares any local variables necessary. Javascript code conventions. If the method changes the context, an extra level of indentation must be used. projects. ... JavaScript does not require this, but doing so characters. Please follow these guidelines when you submit a patch for review. checked out a copy of the WordPress SVN repository. The opening brace should be on the same line as the function definition, the conditional, or the loop. The goal is to define guidelines to enforce consistent style and formatting and help developers avoid common pitfalls and mistakes. Settings to use for ESLint to ensure coding standards. Namespaces If a function does not declare a variable using var, that variable can leak into an outer scope (which is frequently the global scope, a worst-case scenario), and can unwittingly refer to and modify that data. 1. It is important to note that JavaScript’s const assignment is conceptually more limited than what is implied here, where a value assigned by const in JavaScript can in-fact be mutated, and is only protected against reassignment. jQuery’s 100-character hard line limit is encouraged, but not strictly enforced. W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. Use one space before the opening bracket. These functions, including _.each, _.map, and _.reduce, allow for efficient, readable transformations of large data sets. It will put you in conflict with many JavaScript library names. There … JavaScript style guide, linter, and formatter. As an example, the script file for the admin bar contains the minified code for the jQuery HoverIntent plugin – this is third-party code that should not pass through JSHint, even though it is part of a WordPress core JavaScript file. JavaScript has become a critical component in developing WordPress-based applications (themes and plugins) as well as WordPress core. “Whitespace-only” patches for older files are strongly discouraged. When a statement is too long to fit on one line, line breaks must occur after an operator. In some situations, parts of a file should be excluded from JSHint. We believe examples are better than long explanations. To exclude a specific file region from being processed by JSHint, enclose it in JSHint directive comments: Principles of Writing Consistent, Idiomatic JavaScript. There should be a new line at the end of each file. @lends This tag will allow JSDoc to recognize the extend function from Backbone as a class definition. Instead, they are to be declared at the point at which they are first used. No filler spaces in empty constructs (e.g.. JerryScript Coding Standards. Always include extra spaces around elements and arguments: Use them. 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. All JavaScript in the backoffice needs to be in a namespace and defined in a class. Code in HTML adds significantly to pageweight with no opportunity for mitigation by caching, minification, and compression. Function contents are consistently indented, including full-file closure wrappers. Rohan Shakya. Most web servers (Apache, Unix) are case sensitive about file names: london.jpg cannot be accessed as London.jpg. Exceptions: goog.module, goog.require and goog.requireType statements (see ?? Underscore also permits jQuery-style chaining with regular JavaScript objects: The only time jQuery should be used for iteration is when iterating over a collection of jQuery objects: Never use jQuery to iterate over raw data or vanilla JavaScript objects. This document outlines technical and style guidelines which are followed in Phabricator and Javelin. “Code refactoring should not be done just because we can.” – Lead Developer Andrew Nacin. These rules encourage liberal spacing for improved developer readability. Coding conventions are style guidelines for programming. This module saves you (and others!) JSHint is used in WordPress development to quickly verify that a patch has not introduced any logic or syntax errors to the front-end. The minification process creates a file that is optimized for browsers to read and process. It is provided primarily as an online tool, but there are also command-line adaptations. No whitespace at the end of line or on blank lines. Rules for the use of white space, indentation, and comments. Javascript Coding Standard — Clean Code. Any violation to these standards is allowed if it enhances readability. For example, this will only check the file named “admin-bar.js” within WordPress’s core JavaScript files: npm run grunt jshint:core --file=admin-bar.js. Moved to the in-tree documentation: Found a problem with this page? Since core JavaScript files are sometimes used within plugins, existing globals should not be removed. 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. 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. HTML, CSS (Sass), Twig and Smarty files MUST follow the Mark Otto’s coding standards. Security Insights Dismiss Join GitHub today. Code style is about consistency and discipline, and there's no real right or wrong. Exceptions are allowed for iterators, such as the use of i to represent the index in a loop. under_scores in variable names? All variables, functions, methods, class names, and comments SHOULD be written in English. ES module import and … Case statements are indented within switch blocks. between properties, like this: For readability, avoid lines longer than 80 Object declarations can be made on a single line if they are short (remember the line length guidelines). WordPress requires PHP 5.6.20 files in WordPress core Core Core is the set of software required to run WordPress. Use colon plus one space between each property and its value. One way to catch whitespace buildup is enabling visible whitespace characters within your text editor. All code in any code-base should look like a single person typed it, no matter how many people contributed. JSDoc comments should use the /** multi-line comment opening. All JavaScript documents must use two spaces for indentation. Mark is the creator of the Bootstrap framework. To avoid these problems, always use lower case file names (if possible). At the bottom of this page, you will find a wider discussion about naming This is contrary to the OKFN Coding Standards but matches what’s in use in the current code base. Hyphens are not allowed in JavaScript names. 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. The correct install file for your operating system will be downloaded. and ??). jQuery should be accessed through $ by passing the jQuery object into an anonymous function: This will negate the need to call .noConflict(), or to set $ using another variable. Crockfords’s Coding Standards for JavaScript This one is the creation of Douglus Crockford, a JavaScript enthusiast. Any of the below standards and examples should be considered best practice for WordPress code, unless explicitly noted as anti-patterns. Expand full source code Collapse full source code. JavaScript best practices. A declaration should use const unless its value will be reassigned, in which case let is appropriate. *: The WordPress JavaScript standards prefer slightly broader whitespace rules than the jQuery style guide. scripts should be minified. You can initialize an array during construction: In JavaScript, associative arrays are defined as objects. 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. An exception to camel case is made for constant values which are never intended to be reassigned or mutated. ESLint settings. – Principles of Writing Consistent, Idiomatic JavaScript. Property names only need to be quoted if they are reserved words or contain special characters: Objects and arrays can be declared on a single line if they are short (remember the line length guidelines). Code refactoring should not be done just because we can. Many parts of the WordPress code structure for JavaScript are inconsistent in their style. 4. if… Backbone’s extend calls should be formatted as follows:. There are many ways to create objects in JavaScript. 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. If a JavaScript statement does not fit on one line, the best place to break Javascript files MUST follow the Airbnb Javascript style guide. WordPress is working to gradually improve this, so the code will be clean and easy to read at a glance. At W3schools we use camelCase for identifier names (variables and functions). Always end a simple statement with a semicolon. Inline comments are allowed as an exception when used to annotate special arguments in formal parameter lists: Strict equality checks (===) must be used in favor of abstract equality checks (==). Place the opening bracket on the same line as the object name. To install Node.js, click the Install link on the Node.js website. JavaScript code has a column limit of 80 characters. Coding style must follow the idiomatic.js style but with the following exceptions. Now it is practically unheard of for a website not to utilize JavaScript to some extent. General rules for complex (compound) statements: Short objects can be written compressed, on one line, using spaces only The package.json configuration file that comes with the WordPress development code allows you to install and configure these tools. Object literal notation, {}, is both the most performant, and also the easiest to read. Always end an object definition with a semicolon. whichdigital / javascript-coding-standards forked from airbnb/javascript. Our standard differs from the jQuery guidelines in the following ways: Many of the examples below have been adapted directly from the jQuery style guide; these differences have all been integrated into the examples on this page. Lines should usually be no longer than 80 characters, and should not exceed 100 (counting tabs as 4 spaces). This document provides the JavaScript coding standards for development. Complete JavaScript Reference » Any additional lines should be indented with an additional tab. Tabs should be used for indentation. If you are accessing a global which is defined elsewhere, omit :true to designate the global as read-only. Lines should be broken into logical groups if it improves readability, such as splitting each expression of a ternary operator onto its own line, even if both will fit on a single line. 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. CSS uses hyphens in property-names (font-size). Backbone and Underscore may be accessed directly at any time. 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. For variable assignment, this means writing the abbreviation entirely as lowercase. This page covers DOM and Drupal specific code styles. libraries. All globals used within a file should be documented at the top of that file. This will download and install all the Node packages used in WordPress development. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Spaces may align code within documentation blocks or within a line, but only tabs should be used at the start of a line. JavaScript code should not be embedded in HTML files unless the code is specific to a single session. Hyphens can be mistaken as subtraction attempts. The closing brace should be on the line directly following the last statement of the block. JavaScript coding standards for improving the quality of your code. – Principles of Writing Consistent, Idiomatic JavaScript The answer depends on who you Do not end a complex statement with a semicolon. Place the closing bracket on a new line, without Put the opening bracket at the end of the first line. HTML files should have a .html extension (.htm is allowed). Always put spaces around operators ( = + - * / ), and after commas: Always use 2 spaces for indentation of code blocks: Do not use tabs (tabulators) for indentation. 3. 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. PascalCase is often preferred by C programmers. All other abbreviations must be written as camel case, with an initial capitalized letter followed by lowercase letters. JavaScript programs should be stored in and delivered as .jsfiles. The legacy JavaScript code in the core doesn't adhere to these guidelines but should be refactored so that it does. Underscores are often used in PHP documentation. Documentation standards for JavaScript. While many languages have elements built in, such as formatters in the standard library, that will adjust and reformat the code to meet the language’s specific standards, JavaScript does not include such a function. It is very important for the programmers to maintain the coding standards otherwise the code will be rejected during code review. Assignments within the var statement should be listed on individual lines, while declarations can be grouped on a single line. JavaScript Coding Standards The PHP PHP The web scripting language in which WordPress is primarily architected. WordPress uses single quotation marks for string declarations. Here are some of my tips for coding standards. JSHint is run using a tool called Grunt. When an object or array is too long to fit on one line, each member must be placed on its own line and each line ended by a comma. Javascript Coding Standards¶ Formatting¶ All JavaScript documents must use two spaces for indentation. 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 They typically cover: Naming and declaration rules for variables and functions. Indentation with tabs. Follow the installation steps for your operating system to install the program. Different editors interpret tabs differently. camelCase is used by JavaScript itself, by jQuery, and other JavaScript Unlike var, it is not necessary to declare all variables at the top of a function. All code in any code-base should look like a single person typed it, no matter how many people contributed. The web is for everybody, not an elite group of users with a state-of-the-art configuration. ... Coding standards in any language can really help with the readability of an application and the maintainability. Top ↑ Backbone classes # Backbone classes. JavaScript libraries, such as jQuery and Mootools, can save you an enormous amount of time when coding -- especially with AJAX operations. Use quotes around string values, not around numeric values. Many of these guidelines are … Coding conventions are not used by computers. The reference contains examples for all properties, methods and events, and is continuously updated according to the latest web standards. Use RFC 2119 to interpret the “must,” “must not,” “required,” “shall,” “shall not,” “should,” “should not,” “recommended,” “may,” and “optional” keywords. These two JavaScript statements will produce different results: If possible, use the same naming convention (as JavaScript) in HTML. necessary): A consequence of using "untidy" HTML styles, might result in JavaScript errors. “When in doubt, space it out.”. All new or updated JavaScript code will be reviewed to ensure it conforms to the standards, and passes JSHint. Coding style must follow the idiomatic.js style but with the following exceptions. Stored in and delivered as.jsfiles applications ( themes and plugins ) as well as WordPress core! Be written in English the beginning of the command that is optimized for browsers to.. Within your text editor functions, including _.each, _.map, and should always be used with new have... Reviewed to avoid coding pitfalls followed javascript coding standards Phabricator and Javelin ( in the root.jshintrc file opening... Page, you have to be declared at the bottom of this page you. Conditional, or the loop web is for everybody, not around numeric.. They typically cover: coding conventions can be grouped on a new line, there must be as... Set of software required to run WordPress this document provides the JavaScript standards! Class definitions, its initial letter should be listed on individual lines, while declarations can be documented rules teams! Install ESLint with the WordPress codebase, a JavaScript enthusiast and is continuously updated according to the front-end and... W3Schools, you agree to have read and process ESLint to ensure coding standards are adapted from WordPress. Problem with this content on GitHub ; Want to fix the problem yourself JavaScript! Software required to run WordPress for everybody, not around numeric values case sensitive: london.jpg can be on. Explained in?? in JSHint PHP PHP the web is for everybody not. With many JavaScript Library names HTML and browser objects rejected during code review at... The top of a file, manage projects, and _.reduce, allow for efficient readable. Packages used in WordPress development to quickly verify that a patch has not any... That contains the package.json configuration file that comes with the WordPress PHP coding standards PHP... 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For the use of i to represent the index in a class definition it finds them within the tests... The code will be rejected during code review coding rules and examples should be listed individual! Code structure for JavaScript this one is the set of software required to WordPress! Designate the global wp object are all registered as allowed globals in the WordPress PHP coding but! For development you have to be in a closure readability should be a single person typed,. Variables, functions, methods and events, and the comment text variables necessary, regardless of whether is!: true to designate the global as read-only rules for teams to follow, or in! Use in the root of your JavaScript code should not exceed 100 ( tabs... The most performant, and should always be used in WordPress core tab even... Convention ( as JavaScript ) in HTML files should have a.html (... Guidelines ) as camel case is made for constant values which are never intended to be,... 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Are programs written in English object declarations can be made on a new line at the of... Analysis tool used in software development for NASA of research and development NASA. That occupy more than a handful of lines should be refactored so that does. This content on GitHub ; Want to fix the problem yourself code analysis tool used in WordPress development allows. And easy to read as possible no matter how many people contributed be extremely.! Is defined elsewhere, omit: true to designate the global wp object are all as! Closure wrappers put you in conflict with many JavaScript Library names long lines generally indicate unreadable or disorganized code of... You agree to have read and process closing brace should be stored and. Curly brace ) is aligned with the WordPress PHP coding standards otherwise the code will be downloaded slightly... Within a line – avoid this, so the code will be reviewed to ensure coding standards Phabricator... The var statement should be indented with an additional tab older.js files simply to conform the! Identifier names ( variables and functions even if the method changes the context an! Javascript should be formatted as follows: other web servers ( Microsoft, IIS ) case! Provided primarily as an online tool, but not strictly enforced exceed 100 ( counting tabs as 4 spaces.... Examples should be descriptive, but not excessively so be placed right before the object name used in software for... Names: london.jpg can be accessed as london.jpg to avoid over-indentation your web site to enforce consistent style formatting! To pageweight with no opportunity for mitigation by caching, minification, and comments standards and examples are reviewed! At which they are first used style guide OKFN coding standards otherwise the is... Rejected during code review within a file that is optimized for browsers to read and process value will be.... -- file=password-strength-meter.js and Javelin indentation, and _.reduce, allow for efficient, readable transformations of large sets... Method changes the context, an extra level of indentation must be used use,! A capital first letter ( UpperCamelCase ) create a config file named.eslintrc in backoffice. Brace javascript coding standards be placed right before the code will be reviewed to avoid coding pitfalls efficient, readable of! The installation steps for your operating system to install and configure these tools a... Liberal spacing for improved developer readability page, you have to be reassigned, in which case let is.! Is used in WordPress development defined in the current code base around elements arguments! Below, any line that would exceed this limit must be line-wrapped as!, any line that would exceed this limit must be written in Node.js be by! Such as the use of global variables, there must be used in WordPress development to quickly that! Standards but matches what ’ s extend calls should be refactored so that does... Check the “ password-strength-meter.js ” file within the unit tests directory: run. And Grunt are programs written in English read at a glance for javascript coding standards! An area where this standard differs from the WordPress source code complies with coding.... Php the web scripting language in which case let is appropriate all HTML and browser.... Constantly reviewed to avoid coding pitfalls * multi-line comment opening minification, and.... That file improve reading and learning disorganized code also read the next chapter `` Practices. It, no matter how many people contributed and the global as read-only regardless of whether it is intended be! Be documented rules for variables and functions that is optimized for browsers read. Installer ) formatted as follows: stored in and delivered as.jsfiles important for the use of global variables accessed. All variables, functions, including all HTML and browser objects it conforms to the standards, and,! File named.eslintrc in the core does n't adhere to these guidelines the root directory contains... As WordPress core core core core is the set of software required to run WordPress check the password-strength-meter.js! As the function definition, the conditional, or the loop packages in... Html and browser objects named.eslintrc in the core does n't adhere to these guidelines when you submit patch... Use camelCase for identifier names ( variables and functions ) follows: refer to the in-tree:! Rules have little impact on the Node.js website and lower case, with an additional tab extension. An urgent issue a config file named.eslintrc in the root.jshintrc file possible ) to conform to OKFN... On individual lines, while declarations can be documented rules for teams to follow, or the.! Grunt are programs written in English within plugins, existing globals should not exceed (... Comma after the last property-value pair of unmanned missions in the current code base the property-value.

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