Return a closure in Rust by defining a function that outputs an anonymous function block using the `|args| { ... }` syntax.
Return a closure by defining a function that creates and returns an anonymous function block using the |args| { ... } syntax. The compiler infers the closure's type, or you can explicitly return a Box<dyn Fn(...)> if you need a concrete type.
fn make_adder(x: i32) -> impl Fn(i32) -> i32 {
move |y| x + y
}
fn main() {
let add_five = make_adder(5);
println!("{}", add_five(10)); // Output: 15
}
A closure is a small, anonymous function that can remember variables from where it was created. Returning one lets you create custom behavior on the fly, like a calculator that remembers a specific number you gave it earlier. Think of it as handing someone a pre-filled form they can use later without you needing to be there.