# Walkthrough

- [Introduction](/flow-connect/reference/reference/flowscript/walkthrough/introduction.md)
- [Expressions and programs](/flow-connect/reference/reference/flowscript/walkthrough/expressions-and-programs.md)
- [Anatomy of a program](/flow-connect/reference/reference/flowscript/walkthrough/anatomy-of-a-program.md)
- [Variables](/flow-connect/reference/reference/flowscript/walkthrough/variables.md)
- [Simple types](/flow-connect/reference/reference/flowscript/walkthrough/simple-types.md)
- [Nullable types](/flow-connect/reference/reference/flowscript/walkthrough/nullable-types.md)
- [Records](/flow-connect/reference/reference/flowscript/walkthrough/records.md)
- [Sequences](/flow-connect/reference/reference/flowscript/walkthrough/sequences.md)
- [Other types](/flow-connect/reference/reference/flowscript/walkthrough/other-types.md)
- [Arithmetic](/flow-connect/reference/reference/flowscript/walkthrough/arithmetic.md)
- [Other expressions](/flow-connect/reference/reference/flowscript/walkthrough/other-expressions.md)
- [Queries](/flow-connect/reference/reference/flowscript/walkthrough/queries.md)
- [Conditionals and loops](/flow-connect/reference/reference/flowscript/walkthrough/conditionals-and-loops.md)
- [Function definitions](/flow-connect/reference/reference/flowscript/walkthrough/function-definitions.md)
- [Yielding](/flow-connect/reference/reference/flowscript/walkthrough/yielding.md)
- [Built-in functions](/flow-connect/reference/reference/flowscript/walkthrough/built-in-functions.md): This page describes the built-in functions of the Flow Connect platform. Note that additional functions are available in the built-in modules (described in subsequent chapters of this document).
- [DateTime module](/flow-connect/reference/reference/flowscript/walkthrough/datetime-module.md)
- [Seq module](/flow-connect/reference/reference/flowscript/walkthrough/seq-module.md)
- [HTTP module](/flow-connect/reference/reference/flowscript/walkthrough/http-module.md)
- [CSV module](/flow-connect/reference/reference/flowscript/walkthrough/csv-module.md)
- [FlowScript Local storage module](/flow-connect/reference/reference/flowscript/walkthrough/flowscript-local-storage-module.md)
- [JSON module](/flow-connect/reference/reference/flowscript/walkthrough/json-module.md)
- [Trace module](/flow-connect/reference/reference/flowscript/walkthrough/trace-module.md)
- [Record module](/flow-connect/reference/reference/flowscript/walkthrough/record-module.md)
- [XML Module](/flow-connect/reference/reference/flowscript/walkthrough/xml-module.md)
- [FileSystem Module](/flow-connect/reference/reference/flowscript/walkthrough/filesystem-module.md)
- [SFTP Module](/flow-connect/reference/reference/flowscript/walkthrough/sftp-module.md)
- [FTP Module](/flow-connect/reference/reference/flowscript/walkthrough/ftp-module.md)
- [Custom modules](/flow-connect/reference/reference/flowscript/walkthrough/custom-modules.md)
- [Custom Types](/flow-connect/reference/reference/flowscript/walkthrough/custom-types.md)
- [Appendix: Subtyping rules](/flow-connect/reference/reference/flowscript/walkthrough/appendix-subtyping-rules.md)
- [Appendix: Escape sequences](/flow-connect/reference/reference/flowscript/walkthrough/appendix-escape-sequences.md)
- [Appendix: Type checking errors](/flow-connect/reference/reference/flowscript/walkthrough/appendix-type-checking-errors.md)