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Features
========
{{#include ../links.md}}
Easy
----
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* Easy-to-use language similar to JavaScript+Rust with dynamic typing.
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* Tight integration with native Rust [functions] and [types][custom types], including [getters/setters], [methods][custom type] and [indexers].
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* Freely pass Rust variables/constants into a script via an external [`Scope`].
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* Easily [call a script-defined function ]({{rootUrl}}/engine/call-fn.md ) from Rust.
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* Very few additional dependencies (right now only [`smallvec` ](https://crates.io/crates/smallvec/ ));
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for [`no-std`] builds, a number of additional dependencies are pulled in to provide for functionalities that used to be in `std` .
Fast
----
* Fairly low compile-time overhead.
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* Fairly efficient evaluation (1 million iterations in 0.3 sec on a single core, 2.3 GHz Linux VM).
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* Scripts are [optimized][script optimization] (useful for template-based machine-generated scripts) for repeated evaluations.
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Dynamic
-------
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* [Function overloading ]({{rootUrl}}/language/overload.md ).
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* [Operator overloading ]({{rootUrl}}/rust/operators.md ).
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* Organize code base with dynamically-loadable [modules].
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* Dynamic dispatch via [function pointers] with additional support for [currying].
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* Closures via [automatic currying] with capturing shared variables from the external scope.
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* Some support for [object-oriented programming (OOP)][OOP].
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Safe
----
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* Relatively little `unsafe` code (yes there are some for performance reasons).
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* Sand-boxed - the scripting [`Engine`], if declared immutable, cannot mutate the containing environment unless [explicitly permitted ]({{rootUrl}}/patterns/control.md ).
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Rugged
------
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* Protected against malicious attacks (such as [stack-overflow][maximum call stack depth], [over-sized data][maximum length of strings], and [runaway scripts][maximum number of operations] etc.) that may come from untrusted third-party user-land scripts.
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* Track script evaluation [progress] and manually terminate a script run.
Flexible
--------
* Re-entrant scripting [`Engine`] can be made `Send + Sync` (via the [`sync`] feature).
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* Serialization/deserialization support via [`serde` ](https://crates.io/crates/serde ).
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* Support for [minimal builds] by excluding unneeded language [features].
* Supports [most build targets ](targets.md ) including `no-std` and [WASM].
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* Surgically [disable keywords and operators] to restrict the language.
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* Use as a [DSL] by [disabling keywords/operators][disable keywords and operators], [custom operators]
and extending the language with [custom syntax].
