Overview Introduction What is Otter? Who is Otter for? What can you build? Installation Verify your installation Your first program Hello, Otter! The REPL Running .ot files Build a tiny application The otter command Projects Troubleshooting Values and variables Input and output Conditions Loops Lists Functions Objects and properties Files and folders CSV and downloads Error handling Math Nested conditions Modules Running programs Logging and debugging Arguments and environment gone Operators Property access Text Collections Finding files and folders File and folder objects Files Folders try and otherwise JSON Random Dates and time Scope Diagnostic output Reference index Databases The query language (1.1 preview) HTTP requests Web servers XML Web applications State and reactivity Networking Cryptography and secrets Console programming Console input A complete console program Windows applications Controls window button text text box heading card row column panel grid scroll Layout Events All examples Hello World User input Conditions Counting Lists File discovery File organizer Finding files Handling errors Build a Task Manager Build a File Browser Readable like English Structural words Properties vs operations Period and block rules Philosophy