In this chapter, you will learn:
Why there is a need for anonymous inline functions, with type inference for the arguments and the return value type, without having to write braces, and which can access the variables that are alive at the function definition point
How such lightweight functions, named “closures”, can be declared and invoked
The Need for “Disposable” Functions
The Rust way to sort an array in ascending order is this:
let mut arr = [4, 8, 1, 10, 0, 45, 12, 7];
arr.sort();
print!("{:?}", arr);
This will print: "[0, 1, 4, 7, 8, 10, 12, 45]";
But if you want to sort it in descending order, ...
