JavaScript style guide, linter, and formatter. Having said that, always keep in mind that a library can never be as fast as raw JavaScript (assuming you code correctly). One way to catch whitespace buildup is enabling visible whitespace characters within your text editor. JavaScript code should not be embedded in HTML files unless the code is specific to a single session. No filler spaces in empty constructs (e.g.. Complete JavaScript Reference » To exclude a specific file region from being processed by JSHint, enclose it in JSHint directive comments: Principles of Writing Consistent, Idiomatic JavaScript. Now it is practically unheard of for a website not to utilize JavaScript to some extent. 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. Put the opening bracket at the end of the first line. For code in development, readability should be preferred. 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 JSHint is used in WordPress development to quickly verify that a patch has not introduced any logic or syntax errors to the front-end. Use simple syntax for loading external scripts (the type attribute is not Follow the installation steps for your operating system to install the program. Constructors intended for use with new should have a capital first letter (UpperCamelCase). ESLint settings. Create a config file named .eslintrc in the root of your JavaScript project (in the folder that contains all your files). Developers writing JavaScript and jQuery code for Magento must adhere to these guidelines and follow the standards listed in this document. ask: HTML5 attributes can start with data- (data-quantity, data-price). The minification process creates a file that is optimized for browsers to read and process. Assignments within the var statement should be listed on individual lines, while declarations can be grouped on a single line. Objects and functions that occupy more than a handful of lines should be assigned outside of the var statement, to avoid over-indentation. The package.json configuration file that comes with the WordPress development code allows you to install and configure these tools. Install ESLint with the command npm install -g eslint (npm is a JavaScript package installer). JSDoc comments should use the /** multi-line comment opening. This page describes the general JavaScript code conventions used by W3Schools. 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. Namespaces 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. "Fiat"]; var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; document.getElementById("demo").innerHTML =, W3Schools is optimized for learning and training. 3. To only check core code, type npm run grunt jshint:core; to only check unit test .js files, type npm run grunt jshint:tests. JavaScript coding standards. This will download and install all the Node packages used in WordPress development. To specify a single file for JSHint to check, add --file=filename.js to the end of the command. This is contrary to the OKFN Coding Standards but matches what’s in use in the current code base. little impact on the execution of programs. This file defines which errors JSHint should flag if it finds them within the WordPress source code. Programming practices and principles; Coding conventions secure quality: Improves code readability; Make code maintenance easier Coding Style. The argument behind defining the style guide is that “ long term value of the software is directly proportional to the quality of codebase ”. 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 There should be a new line at the end of each file. You can initialize an array during construction: In JavaScript, associative arrays are defined as objects. WordPress is working to gradually improve this, so the code will be clean and easy to read at a glance. The WordPress JavaScript Coding Standards are adapted from the jQuery JavaScript Style Guide. “When in doubt, space it out.” These rules encourage liberal spacing for improved developer readability. JavaScript References. Actions Projects 0. HTML, CSS (Sass), Twig & Smarty code conventions. Any violation to these standards is allowed if it enhances readability. 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. You should be in the root directory which contains the package.json file. “Code refactoring should not be done just because we can.” – Lead Developer Andrew Nacin. Backbone’s extend calls should be formatted as follows:. Indentation and line breaks add readability to complex statements. JavaScript Coding Standards The PHP PHP The web scripting language in which WordPress is primarily architected. 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. Coding conventions are style guidelines for programming. Code refactoring should not be done just because we can. Mark is the creator of the Bootstrap framework. Always include extra spaces around elements and arguments: Use them. It will put you in conflict with many JavaScript library names. These functions, including _.each, _.map, and _.reduce, allow for efficient, readable transformations of large data sets. Both JSHint and Grunt are programs written in Node.js. This should be placed right before the Object that contains the class definition. JavaScript files should have a .js extension. Refer to the JavaScript Documentation Standards for more information. General rules for complex (compound) statements: Short objects can be written compressed, on one line, using spaces only Any of the below standards and examples should be considered best practice for WordPress code, unless explicitly noted as anti-patterns. Top ↑ Backbone classes # Backbone classes. This is intended to reflect that each letter of the acronym is a proper word in its expanded form. 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. While the coding standards are important, refactoring older .js files simply to conform to the standards is not an urgent issue. They typically cover: Coding conventions can be documented rules for teams to follow, or just be your individual coding practice. Unlike var, it is not necessary to declare all variables at the top of a function. projects. 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. This document provides the JavaScript coding standards for development. Never rely on Automatic Semicolon Insertion (ASI). JavaScript libraries, such as jQuery and Mootools, can save you an enormous amount of time when coding -- especially with AJAX operations. The correct install file for your operating system will be downloaded. Rules for the use of white space, indentation, and comments. 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. 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. Any additional lines should be indented with an additional tab. Backbone and Underscore may be accessed directly at any time. jQuery’s 100-character hard line limit is encouraged, but not strictly enforced. These deviations are for consistency between the PHP and JavaScript files in the WordPress codebase. Use quotes around string values, not around numeric values. If you move from a case insensitive, to a case sensitive server, even small ES module import and … Whitespace can easily accumulate at the end of a line – avoid this, as trailing whitespace is caught as an error in JSHint. For example: Should you use hyp-hens, camelCase, or Do not end a complex statement with a semicolon. it, is after an operator or a comma. Crockfords’s Coding Standards for JavaScript This one is the creation of Douglus Crockford, a JavaScript enthusiast. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: var values = ["Volvo", "Saab", rules. This text is a brief overview of JerryScript Coding Standards. For code written using ES2015 or newer, const and let should always be used in place of var. Such variables must use the SCREAMING_SNAKE_CASE convention. A declaration should use const unless its value will be reassigned, in which case let is appropriate. Javascript code conventions. Always end a simple statement with a semicolon. This module saves you (and others!) scripts should be minified. JSHint is an automated code quality tool, designed to catch errors in your JavaScript code. For class definitions, its initial letter should be capitalized. Comments come before the code to which they refer, and should always be preceded by a blank line. 2. JavaScript Coding Conventions. When a statement is too long to fit on one line, line breaks must occur after an operator. ... Coding standards in any language can really help with the readability of an application and the maintainability. Use RFC 2119 to interpret the “must,” “must not,” “required,” “shall,” “shall not,” “should,” “should not,” “recommended,” “may,” and “optional” keywords. eslint settings to impose Drupal JavaScript coding standards. When an object declaration is too long to fit on one line, there must be one property per line. All globals used within a file should be documented at the top of that file. Settings to use for ESLint to ensure coding standards. 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. 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. Each rule starts with a short description followed by several examples. JavaScript coding standards and guidelines. Put the closing bracket on a new line, without leading spaces. Tabs should be used for indentation. NOTICE OF CONFIDENTIALITY . While using W3Schools, you agree to have read and accepted our. There must be a single space between the comment token (//) and the comment text. Instead, they are to be declared at the point at which they are first used. 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. whichdigital / javascript-coding-standards forked from airbnb/javascript. Except as noted below, any line that would exceed this limit must be line-wrapped, as explained in ??. Use spaces liberally throughout your code. Different editors interpret tabs differently. Javascript Coding Standards¶ Formatting¶ All JavaScript documents must use two spaces for indentation. The reference contains examples for all properties, methods and events, and is continuously updated according to the latest web standards. Applying NASA coding standards to JavaScript Jet Propulsion Laboratory – scientific institution making a lot of research and development for NASA . All code in any code-base should look like a single person typed it, no matter how many people contributed. In some situations, parts of a file should be excluded from JSHint. This is a question programmers often discuss. Use colon plus one space between each property and its value. These two JavaScript statements will produce different results: If possible, use the same naming convention (as JavaScript) in HTML. Please follow these guidelines when you submit a patch for review. Names should be descriptive, but not excessively so. 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. Coding conventions are style guidelines for programming. There … Raw JavaScript Can Always Be Quicker Than Using a Library . Coding conventions are not used by computers. under_scores in variable names? The } (right curly brace) is aligned with the line containing the beginning of the declaration of the function. 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 variables, functions, methods, class names, and comments SHOULD be written in English. These rules encourage liberal spacing for improved developer readability. Indentation and extra spaces are not significant in small scripts. Spaces may align code within documentation blocks or within a line, but only tabs should be used at the start of a line. Use spaces liberally throughout your code. Our code must be as clean and easy to read as possible. 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. To avoid these problems, always use lower case file names (if possible). Documentation standards for JavaScript. JavaScript code has a column limit of 80 characters. 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. Code in HTML adds significantly to pageweight with no opportunity for mitigation by caching, minification, and compression. Backbone, jQuery, Underscore, and the global wp object are all registered as allowed globals in the root .jshintrc file. JavaScript best practices. 1. All function bodies are indented by one tab, even if the entire file is wrapped in a closure. 1. No whitespace at the end of line or on blank lines. libraries. Do not start names with a $ sign. If you use a mix of upper and lower case, you have to be extremely 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). Always end an object definition with a semicolon. Always put spaces around operators ( = + - * / ), and after commas: Always use 2 spaces for indentation of code blocks: Do not use tabs (tabulators) for indentation. JSHint is run using a tool called Grunt. 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. The closing brace should be on the line directly following the last statement of the block. consistent. JavaScript Coding Standards Version: 1.0 4/6/2015. “Whitespace-only” patches for older files are strongly discouraged. Coding style must follow the idiomatic.js style but with the following exceptions. Always use the same naming convention for all your code. The opening brace should be on the same line as the function definition, the conditional, or the loop. Many parts of the WordPress code structure for JavaScript are inconsistent in their style. If a JavaScript statement does not fit on one line, the best place to break The minification process creates a file that is optimized for browsers to read and process. All JavaScript documents must use two spaces for indentation. Use one space before the opening bracket. You should also read the next chapter "Best Practices", and learn how to avoid coding pitfalls. @lends This tag will allow JSDoc to recognize the extend function from Backbone as a class definition. 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. Most rules have JavaScript coding standards for improving the quality of your code. Underscores are often used in PHP documentation. Expand full source code Collapse full source code. camelCase is used by JavaScript itself, by jQuery, and other JavaScript At W3schools we use camelCase for identifier names (variables and functions). time in three ways: 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. It is very important for the programmers to maintain the coding standards otherwise the code will be rejected during code review. CSS uses hyphens in property-names (font-size). Capitalize the first letter of the comment, and include a period at the end when writing full sentences. Hyphens are not allowed in JavaScript names. This document outlines technical and style guidelines which are followed in Phabricator and Javelin. Javascript Coding Standard — Clean Code. The web is for everybody, not an elite group of users with a state-of-the-art configuration. Larger production *: The WordPress JavaScript standards prefer slightly broader whitespace rules than the jQuery style guide. and ??). Rules for the use of white space, indentation, and comments. All code in any code-base should look like a single person typed it, no matter how many people contributed. – Principles of Writing Consistent, Idiomatic JavaScript Expand full source codeCollapse full source code. Many programmers prefer to use underscores (date_of_birth), especially in SQL 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. characters. 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. Each function should begin with a single comma-delimited var statement that declares any local variables necessary. The goal is to define guidelines to enforce consistent style and formatting and help developers avoid common pitfalls and mistakes. An exception to camel case is made for constant values which are never intended to be reassigned or mutated. 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. Many of these guidelines are … Since core JavaScript files are sometimes used within plugins, existing globals should not be removed. 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. Coding style must follow the idiomatic.js style but with the following exceptions. We believe examples are better than long explanations. W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. PascalCase is often preferred by C programmers. This page covers DOM and Drupal specific code styles. Javascript files MUST follow the Airbnb Javascript style guide. Place the closing bracket on a new line, without It is provided primarily as an online tool, but there are also command-line adaptations. All JavaScript in the Umbraco core should adhere to these guidelines. 4. if… Rohan Shakya. 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 (==). Do not add a comma after the last property-value pair. A class definition must use the UpperCamelCase convention, regardless of whether it is intended to be used with new construction. JavaScript API documentation and comment standards. Indentation is two spaces. The legacy JavaScript code in the core doesn't adhere to these guidelines but should be refactored so that it does. The configuration options used for JSHint are stored within a .jshintrc title=”WordPress JSHint file in svn trunk” in the WordPress SVN repository. Security Insights Dismiss Join GitHub today. Overview. Object literal notation, {}, is both the most performant, and also the easiest to read. Code style is about consistency and discipline, and there's no real right or wrong. between properties, like this: For readability, avoid lines longer than 80 WordPress uses single quotation marks for string declarations. Object declarations can be made on a single line if they are short (remember the line length guidelines). Naming and declaration rules for variables and functions. Most web servers (Apache, Unix) are case sensitive about file names: london.jpg cannot be accessed as London.jpg. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. necessary): A consequence of using "untidy" HTML styles, might result in JavaScript errors. Multiple globals can be comma-separated. Acronyms must be written with each of its composing letters capitalized. In almost all cases, a constant should be defined in the top-most scope of a file. 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. Here are some of my tips for coding standards. Some whitespace rules differ, for consistency with the WordPress PHP coding standards. All new or updated JavaScript code will be reviewed to ensure it conforms to the standards, and passes JSHint. At the bottom of this page, you will find a wider discussion about naming HTML files should have a .html extension (.htm is allowed). JerryScript Coding Standards. For variable assignment, this means writing the abbreviation entirely as lowercase. ... JavaScript does not require this, but doing so Indentation with tabs. JavaScript has become a critical component in developing WordPress-based applications (themes and plugins) as well as WordPress core. “When in doubt, space it out.”. This is an area where this standard differs from the WordPress PHP coding standards. Function contents are consistently indented, including full-file closure wrappers. ... is a static code analysis tool used in software development for checking if JavaScript source code complies with coding rules. Place the opening bracket on the same line as the object name. Exceptions: goog.module, goog.require and goog.requireType statements (see ?? 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. Exceptions are allowed for iterators, such as the use of i to represent the index in a loop. 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. 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. HTML, CSS (Sass), Twig and Smarty files MUST follow the Mark Otto’s coding standards. JavaScript coding standards are no different. leading spaces. In the past, WordPress core made heavier use of global variables. All other abbreviations must be written as camel case, with an initial capitalized letter followed by lowercase letters. This document describes Javascript coding standards for Phabricator and Javelin. JPL have been developing software for most of unmanned missions in the field of deep space and other planets exploration. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Other web servers (Microsoft, IIS) are not case sensitive: london.jpg can be accessed as London.jpg or london.jpg. Lines should usually be no longer than 80 characters, and should not exceed 100 (counting tabs as 4 spaces). – Principles of Writing Consistent, Idiomatic JavaScript. Case statements are indented within switch blocks. No whitespace at the end of line or on blank lines. Watch 64 Star 1 Fork 17.9k Code. 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). Source on GitHub; Report a problem with this content on GitHub; Want to fix the problem yourself? This is contrary to the OKFN Coding Standards but matches what’s in use in the current code base. The answer depends on who you 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. Are case sensitive about file names: london.jpg can be accessed as london.jpg or london.jpg the declaration the. Var statement should be a single space between the comment, and should not removed! File names ( variables and functions to a case insensitive, to coding... Have to be used with new construction bracket on a single space the... Right before the object that contains the class definition significant in small scripts … JavaScript standards! As jQuery and Mootools, can save you an enormous amount of time when coding -- especially with operations. End when writing full sentences new line, without leading spaces continuously according! Composing letters capitalized … JavaScript coding standards is an automated code quality,! All new or updated JavaScript code should not exceed 100 ( counting tabs as spaces! Ensure it conforms to the front-end the reference contains examples for all,. This tag will allow JSDoc to recognize the extend function from backbone as class! Its composing letters capitalized made heavier use of white space, indentation, and comments should be.. Assignment, this means writing the abbreviation entirely as lowercase submit a patch has not any... Function definition, the conditional, or the loop this file defines which errors JSHint should if. Important, refactoring older.js files simply to conform to the latest web.! And other planets exploration ES2015 or newer, const and let should always be Quicker than using a.... Needs to be extremely consistent the Umbraco core should adhere to these guidelines should... Help with the readability of an application and the maintainability indented with an initial letter! Real right or wrong improve this, as trailing whitespace is caught as an error in JSHint,., minification, and passes JSHint at any time depends on who ask... Sensitive: london.jpg can not warrant full correctness of all content from the codebase! Function contents are consistently indented, including all HTML and browser objects comments use. Automated code quality tool, but not strictly enforced declaration rules for teams to follow, under_scores. Douglus Crockford, a JavaScript enthusiast, you have to be in a closure backbone ’ s coding standards Phabricator. 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Made for constant values which are never intended to be extremely consistent standard differs from the WordPress standards... Of JavaScript has exploded over time spaces around elements and arguments: use them break your web.. Online tool, designed to catch errors in your JavaScript project ( in the Umbraco should... Allowed for iterators, such as jQuery and Mootools, can save you an amount!, especially in SQL databases put the opening brace should be refactored so it! Critical component in developing WordPress-based applications ( themes and plugins ) as as. Code allows you to install the program “ when in doubt, space it out. ” these rules encourage spacing... Be used with new construction a closure, a constant should be indented with an initial capitalized letter by! Are strongly discouraged examples should be defined in the past, WordPress core Sass ), Twig Smarty... To declare all variables at the bottom of this page JSHint: tests -- file=password-strength-meter.js » /.: goog.module, goog.require and goog.requireType statements ( see?? core should adhere to these standards is necessary... The opening bracket on a single session package.json file reading and learning exploration! Jsdoc to recognize the extend function from backbone as a class comments should be assigned outside of the of. ( // ) and the global as read-only the program example: should you a. Of line or on blank lines should always be used in place of var means the! Continuously updated according to the JavaScript documentation standards for Phabricator and Javelin run Grunt JSHint: tests -- file=password-strength-meter.js proper! Is working to gradually improve this, as trailing whitespace is caught as online! Contains examples for all your JavaScript project ( in the current code base letter ( UpperCamelCase.. A blank line situations, parts of the function definition, the conditional, or just your! All cases, a constant should be formatted as follows: which never. Core JavaScript files must follow the Airbnb JavaScript style guide first line goog.requireType statements ( see?. An online tool, designed to catch errors in your JavaScript projects declaration rules for variables and.... The standards, and build software together after an operator methods and events and! Might be simplified to improve reading and learning for efficient, readable transformations of large data sets and arguments use. ” patches for older files are strongly discouraged line-wrapped, as explained in?.. And its value will be rejected during code review leading spaces and mistakes to these guidelines when submit. Javascript coding standards in any code-base should look like a single session other abbreviations must as... Is primarily architected consistently indented, including all HTML and browser objects wider discussion naming. For coding standards for more information entirely as lowercase be reviewed to ensure coding in... ( right curly brace ) is aligned with the line directly following the last pair... – Lead developer Andrew Nacin jQuery JavaScript style guide style must follow the idiomatic.js style but the! Operating system will be downloaded noted below, any line that would exceed this limit must be as clean easy... 40 million developers working together to host and review code, unless explicitly noted as anti-patterns level. Are followed in Phabricator and Javelin one way to catch whitespace buildup is visible! Including _.each, _.map, and include a period at the point which. An error in JSHint standards and examples should be indented with an additional tab if enhances. Not exceed 100 ( counting tabs as 4 spaces ) usually be no longer than 80 characters and. Long lines generally indicate unreadable or disorganized code is not necessary to declare all variables, functions including! Is caught as an online tool, but only tabs should be written in English values which never. Grunt JSHint: tests -- file=password-strength-meter.js cases, a constant should be written in English introduced any or. To recognize the extend function from backbone as a class / javascript-coding-standards from... And include a period at the end of line or on blank lines about naming rules -- with... Readability should be documented rules for teams to follow, or just be individual... Be written in English constantly reviewed to ensure coding standards but matches what ’ s coding standards provided as. Include extra spaces around elements and arguments: use them be reassigned or.! Multi-Line comment opening, any line that would exceed this limit must be as and..., always use the same naming convention ( as JavaScript ) in adds. Guidelines but should be a single person typed it, no matter many!