JavaScript

Sample

• Prefer ES6 classes over prototypes.
• Use strict equality checks (===and!==) except when comparing against (nullorundefined).
• Prefer arrow functions=>, over the function keyword except when defining classes or methods.
• Use semicolons at the end of each statement.
• Prefer single quotes.
• UsePascalCase 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.

Other good practices.