NebulaFox

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',

NebulaFox

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Toggle Button',

NebulaFox

fn convert<S>(option: Option<S>) -> Option<String>
where
    S: Into<String>,
{
    match option {
        Some(string) => Some(string.into()),
        None => None
    }
}

NebulaFox

use rand; // 0.7.3
use rand::Rng;

fn make_a_string_with_optional<S>(option: Option<S>) -> String
where
    S: AsRef<str>,
{
    let mut s = String::from("Hello");
    if let Some(string) = option {
        s.push_str(" ");

NebulaFox

use rand; // 0.7.3
use rand::Rng;

#[derive(Debug, PartialEq)]
struct Wrap<T> {
    inside: T
}

impl<T> Wrap<T> {
    fn new(inside: T) -> Wrap<T> {

NebulaFox

use rand; // 0.7.3
use rand::Rng;

#[derive(Debug, PartialEq)]
struct Wrap<T> {
    inside: T
}

impl<T> Wrap<T> {
    fn new(inside: T) -> Wrap<T> {

NebulaFox

#[allow(dead_code)]
fn contains<'a, V, T, Q>(arr: V, value: &Q) -> bool
where
    T: 'a + std::cmp::PartialEq<Q>,
    V: std::iter::IntoIterator<Item = &'a T>
{
    arr.into_iter().any(|v| v == value)
}

NebulaFox

use std::collections::HashSet;

fn contains<T, Q>(arr: &HashSet<T>, value: &Q) -> bool
where
    T: std::cmp::PartialEq<Q>,
{
    arr.iter().any(|v| v == value)
}

fn main() {

NebulaFox

use std::collections::HashSet;

fn main() {
    let hs_str: HashSet<&str> = ["a", "b", "c"].iter().copied().collect();
    let hs_string: HashSet<String> = vec!["a".to_string(), "b".to_string(), "c".to_string()]
        .into_iter()
        .collect();

    let value_str = "b";
    let value_string = String::from(value_str);

NebulaFox

fn main() {
    let array_str = ["a", "b", "c"];
    let array_string = ["a".to_string(), "b".to_string(), "c".to_string()];

    let value_str = "b";
    let value_string = String::from(value_str);

    let result_str = array_str.contains(&value_string);
    let result_string = array_string.contains(&value_str);
    let result_literal = array_string.contains("b");