small feature request for foldmap

[zhibo501]

Hi guys,

Is it possible to implement foldmap function for Iterator?

Like this:

fn funny(v: Vec<i32>) -> Vec<i32> {
	v.iter()
		.foldmap(0, |acc, x| acc + x)
		.collect()
}

which is equals to :

fn funny(v: Vec<i32>) -> Vec<i32> {
        let mut total = 0;
	v.iter()
		.map(|x| {total = total + x; total})
		.collect()
}

Thanks.

[jonas-schievink]

Hi! This issue tracker is mainly meant for bug reports and concrete, small feature requests. Questions like this are better asked in the user forum at https://users.rust-lang.org/ or on one of the chat platforms used by the Rust community.

[zhibo501]

@jonas-schievink

Sorry, I didn't make it clear. I want to make a small requirement for Iteration to support foldmap.

In this way, foldmap can be composed conveniently than map.

fn funny(v: Vec<i32>) -> Vec<i32> {
	v.iter()
		.foldmap(0, |acc, x| acc + x)
                .foldmap(1, |acc, x| acc * x)
		.collect()
}