Building Holochain Apps: Zome Code¶
Recall that for the DNA of a hApp, there can be many Zomes, and each one will have their own source code. Think of Zomes as the fundamental unit of composability for DNA. As a DNA developer you can think of Zomes as modules. We expect developers to reuse Zomes written by others, and thus Zomes can call one another’s functionality, using the
call API function. Though currently Rust is the only available language for writing Zomes, note that these Zomes could be written in different languages (any language that compiles to WebAssembly) from one another in the future, and still access one another’s functionality.
In the near future, this is likely to expand in diversity on both sides, Zome code and testing code.
Throughout this chapter, there will be plenty of examples given as to writing Zome code in Rust.
This chapter starts with a step by step tutorial, and goes on with a detailed explanation of the affordances of Holochain, and how to use its core functions.