Understanding Rust Closures

3 months ago

Closures in Rust are similar to functions but can capture variables from their environment.
Closures can capture variables by shared reference, mutable reference, or by value.
The `FnOnce` trait is implemented by closures that can be called at least once.
The `FnMut` trait is for closures that can be called multiple times and may mutate captured variables.
The `Fn` trait is for closures that can be called multiple times without mutating captured variables.
The `move` keyword forces a closure to take ownership of captured variables, even if it only needs a reference.
Closures are desugared into structs that implement one or more of the `Fn`, `FnMut`, or `FnOnce` traits.
The `move` keyword is useful when spawning threads or returning closures from functions to ensure proper ownership.

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