name: ruby-style-guide description: Ruby code style conventions. Use when writing, reviewing, or refactoring Ruby code.

Ruby Style Guide

Apply these conventions when writing or modifying Ruby code.

Guidelines

• When writing a Ruby script or CLI, always use Thor.
• Prefer double quotes for strings; use single quotes only when the string contains double quotes, in shell commands with interpolation, or when following existing code patterns.
• Use parallel assignment for instance variables when initializing from local variables with matching names; split across two lines when assigning 3 or more.
• Indent private methods by 2 additional spaces after the private keyword.
• Prefer case when over if elsif for multiple conditional branches.
• Put if and unless on a separate line, except when using return or raise without arguments or with one short argument: return if failed?, return false if failed?, raise unless succeeded?, raise error unless succeeded?
• Use guard clauses for early returns.
• Use safe navigation operator (&.) for nil checks.
• Add a blank line after multi-line block headers before the block body.
• Use multi-line, leading-dot chaining when calling more than one method in a row.
• Prefer chaining over temporary variables when it stays readable; then and tap are often helpful.
• Prefer numbered parameters (_1, _2) for small blocks; use it only when numbered params don't work.
• Prefer endless method definitions for simple, single-expression methods.