# Functions The functions folder contains all the blocks you need to create functions. Functions are a fundamental concept in programming that allow you to group blocks and code together to execute it as a single unit. They are like reusable blocks of code that can be called from different parts of your program, making your code more modular and easier to manage. Functions are a powerful tool for writing structured, maintainable, and reusable code in Blockly. By mastering the use of functions, you can significantly improve the quality and efficiency of your programs.

### Function without output

This block represents a function without an input. Its built out of different parts: * In the image, the "do something" is the name of the functions that will be recalled in the code. It's important to use different names for the functions. * By clicking on the question mark you can add a description of the function, this can be useful when you need to debug your code or explain to other programmers what your code is doing in that part. * By clicking on the gear you can choose which input to insert into your function. * The part inside the block, between the connect and the socket will contain all the sequences that the function will need to perform. ### Function with outputs

This blocks is virtually identical to the previous block described but it returns an output that you've chosen. Instead, when statements are not allowed this function "closes" the gap and when it's called it will return what you add to the return socket. ### Check condition

Note: This block can only be used in a function. With this block, you can check a condition. If the value put in the 'if' socket is true then it will return the value in the 'return' socket. If the value is not true the function will end the program. ### Call function

In order to call a function you must create a do something block and give it the same name as the function you want to call. --- # 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://lessons.mistyrobotics.com/blockly-elements/advanced-blocks/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.