1 stable release
1.0.0 | Oct 23, 2024 |
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#140 in No standard library
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Combinatory
You are reading the documentation for combinatory version 1.0.0
Allows to combinate values of two dimensional iterators / collections.
For example, the combinations of each value [1, 2]
with the values [a, b]
are:
- (1,a).
- (1,b).
- (2,a).
- (2,b).
The following code shows every combination of a menu-deal composed of a main, a side, and a dessert, having two options for each:
use combinatory::Combinatory;
const SIDES: &[&'static str] = &["Soup", "Bread and butter"];
const MAIN: &[&'static str] = &["Chicken", "Burger with fries"];
const DESSERTS: &[&'static str] = &["Vanilla ice cream", "Souffle"];
let possible_menus = Combinatory::new([SIDES, MAIN, DESSERTS])
.ref_combinations()
.enumerate()
.map(|(menu_index, possible_menu)| {
format!("{} - {}", menu_index + 1, possible_menu
.map(|string|string.to_string()).collect::<Vec<_>>().join(", "))
})
.collect::<Vec<_>>()
.join("\n");
println!("{possible_menus}");
assert_eq!(possible_menus,
"1 - Soup, Chicken, Vanilla ice cream
2 - Soup, Chicken, Souffle
3 - Soup, Burger with fries, Vanilla ice cream
4 - Soup, Burger with fries, Souffle
5 - Bread and butter, Chicken, Vanilla ice cream
6 - Bread and butter, Chicken, Souffle
7 - Bread and butter, Burger with fries, Vanilla ice cream
8 - Bread and butter, Burger with fries, Souffle");
This code will print:
1 - Soup, Chicken, Vanilla ice cream
2 - Bread and butter, Chicken, Vanilla ice cream
3 - Soup, Fillet with fries, Vanilla ice cream
4 - Bread and butter, Fillet with fries, Vanilla ice cream
5 - Soup, Chicken, Souffle
6 - Bread and butter, Chicken, Souffle
7 - Soup, Fillet with fries, Souffle
8 - Bread and butter, Fillet with fries, Souffle