[−][src]Module show_notes::e025

Traits Deep Dive, Part 3

Show Notes

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Example

You can see all of the pieces of the final example described in the show here (and the module has the required definitions for Point).

let points = vec![
    Point { x: 1.0, y: 2.0 },
    Point { x: 12.0, y: 4.3 },
    Point { x: -5.4, y: 18.7 },
];

let origin = Point::default();

// This is the version we start with. It works fine, but it's not elegant.
let distances_inline: Vec<f32> = points
    .iter()
    .map(|point| {
        let change = point - &origin;
        (change.x.powi(2) + change.y.powi(2)).sqrt()
    })
    .collect();

// This version is *much* cleaner!
let distances_impl: Vec<f32> = points.iter().map(distance_from_impl(&origin)).collect();

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Structs

Point
Script

e025: Traits Deep Dive, Part III

Functions

distance_from_alias
distance_from_boxed
distance_from_impl

Type Definitions

DistanceFrom