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max of f64 in Rust

I have a vector of prices (f64). I would like to compute the highest price.

What is the current easiest and most idiomatic way to compute the max of a collection of f64 in rust ?

There has been some discussion about Ord and f64 but I am not sure what is the most up-to-date and less hacky way to do so.

I rely on the following but I imagined there was some built in operation

let max = prices.iter().fold(None, |r, &n| match r {
    Some(p) => Some(f64::max(p, n)),
    None => Some(e),
});

(which is just a fold for some free monoid)

Solution

  • As of Rust 1.43, you can write this:

    my_iterator.fold(f64::NEG_INFINITY, f64::max)

    Explanation: use f64::NEG_INFINITY as the initial value, as it is the neutral element for the f64::max operation.