# Functions Functions are sequences of statements that perform a specific task. Functions have parameters (inputs) and an optional return value (output). Functions are typed: the function type consists of the parameter types and the return type. Functions are values, i.e., they can be assigned to constants and variables, and can be passed as arguments to other functions. This behavior is often called "first-class functions". --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://max-daunarovich.gitbook.io/flow-network/introduction/functions.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.