dart-best-practices

Dart Best Practices 1. When to use this skill Use this skill when: Writing or reviewing Dart code. Looking for guidance on idiomatic Dart usage. 2. Best Practices Multi-line Strings Prefer using multi-line strings ( ''' ) over concatenating strings with + and \n , especially for large blocks of text like SQL queries, HTML, or PEM-encoded keys. This improves readability and avoids lines_longer_than_80_chars lint errors by allowing natural line breaks. Avoid: final pem = '-----BEGIN RSA PRIVATE KEY-----\n' + base64Encode ( fullBytes ) + '\n-----END RSA PRIVATE KEY-----' ; Prefer: final pem = ''' -----BEGIN RSA PRIVATE KEY----- ${ base64Encode ( fullBytes ) } -----END RSA PRIVATE KEY-----''' ; Line Length Avoid lines longer than 80 characters, even in Markdown files and comments. This ensures code is readable in split-screen views and on smaller screens without horizontal scrolling. Prefer: Target 80 characters for wrapping text. Exceptions are allowed for long URLs or identifiers that cannot be broken.