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# Description - Refactors `first` and `last` using `Vec::truncate` and `Vec::drain`. - `std::mem::take` was also used to eliminate a few `Value` clones. - The `NeedsPositiveValue` error now uses the span of the `rows` argument instead of the call head span. - `last` now errors on an empty stream to match `first` which does error. - Made metadata preservation more consistent. # User-Facing Changes Breaking change: `last` now errors on an empty stream to match `first` which does error.
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.