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This topic has been translated from a Chinese forum by GPT and might contain errors.Original topic: IoC + DI设计模式在Rust的技术落地，严谨灵活！
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username: 非凸科技
【Rust - Strategy / Policy Pattern】, 【OOP - Dependency Inversion Pattern】, 【Javascript - Callback Function Pattern】, all belong to the same category of design pattern combination, namely 【Inversion of Control + Dependency Injection (IoC + DI)】.
So, how is 【IoC + DI】 implemented in Rust?
Compared to weakly-typed Js and strongly-typed Rust:
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Using Trait methods to define the function signature of “callback functions” — Js does not have types, so there is no need to formally declare (callback) function signatures. All technical details are encapsulated within this callback function in a way that is transparent to the IoC container.
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Using (private) fields of Trait implementation classes to capture variables from outside the IoC container — One of the innate skills of Js functions is 【capturing variables】, so there is no need to explicitly write such code. This way, injecting through the DI interface includes not only functional “behavior” but also additional state information (independent of input data).
Compared to Java, which excels at handling the 【heap】, Rust also allows injecting complex data type 【stack】 variable values into the IoC container, regardless of whether the variable value is 【statically dispatched】 or 【dynamically dispatched】.
Therefore, the technical implementation of the 【IoC + DI】 design pattern in Rust is more rigorous than in Js and more flexible than in Java.