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JavaScript

Sample

  • Use the latest stable JavaScript syntax with a transpiler, such as babel.
  • Use ESLint and Prettier for auto-formatting and auto-fixing
  • Use Jest for unit testing
  • Prefer ES6 classes over prototypes.
  • Use strict equality checks (=== and !==) except when comparing against (null or undefined).
  • Prefer arrow functions =>, over the function keyword except when defining classes or methods.
  • Use semicolons at the end of each statement.
  • Prefer single quotes.
  • Prefer ES6 destructuring over object literal notation.
  • Use ES6 spread and rest operator wherever possible for a cleaner code.
  • Use PascalCase for classes, lowerCamelCase for variables and functions, SCREAMING_SNAKE_CASE for constants, _singleLeadingUnderscore for private variables and functions.
  • Prefer template strings over string concatenation.
  • Prefer promises over callbacks.
  • Prefer array functions like map and forEach over for loops.
  • Use const for declaring variables that will never be re-assigned, and let otherwise.
  • Avoid var to declare variables.
  • Use a trailing comma after each item in a multi-line array or object literal, including the last item.
  • Include a to_param or href attribute when serializing ActiveRecord models, and use that when constructing URLs client side, rather than the ID.
  • Prefer data-* attributes over id and class attributes when targeting HTML elements. #462
  • Avoid targeting HTML elements using classes intended for styling purposes. #462