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# Description Our current flattening code creates a bunch of intermediate `Vec`s for each function call. These intermediate `Vec`s are then usually appended to the current `output` `Vec`. By instead passing a mutable reference of the `output` `Vec` to each flattening function, this `Vec` can be reused/appended to directly thereby eliminating the need for intermediate `Vec`s in most cases.
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.