Add maximum and minimum and other functions

language design
1

There should be a convenience way to get the maximum of an array or a set. Which would work like this.

assert_eq!([1,2,3].maximum(), 3);
assert_eq!([1,2,3].minimum(), 1);
2

There is already max on iterators for this purpose:

assert_eq!([1, 2, 3].into_iter().max().unwrap(), 3);
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3

There's also this, experimentally: smallest in std::cmp - Rust

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