18: Add solution for Rust track exercise "Proverb".

[?]

Aaw9nJhsNmfzFih9mKyNw9mV8CgERXJkRa1kK1Kx3LQH

Aug 23, 2021, 11:10 AM

QA5RWGHZQHQHGJMWJX6ADDGSW4Q6KVVUH3M4HU7MXUR6SIVYJX2AC

Dependencies

[2] QK6XE5XF 13: Add Rust track exercises "Beer Song", "Proverb", "Difference Of Squares", "Sum Of Multiples", "Grains", "Prime Factors", "Armstrong Numbers" and "Reverse String".

Change contents

replacement in rust/proverb/tests/proverb.rs at line 5

[2.12348]→[2.12348:12575](∅→∅)

let input = vec!["nail", "shoe"];
let expected = vec![
"For want of a nail the shoe was lost.",
"And all for the want of a nail.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);

[2.12348]

[2.12575]

let input = vec!["nail", "shoe"];
let expected = vec![
"For want of a nail the shoe was lost.",
"And all for the want of a nail.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);
replacement in rust/proverb/tests/proverb.rs at line 18

[2.12676]→[2.12676:12962](∅→∅)

let input = vec!["nail", "shoe", "horse"];
let expected = vec![
"For want of a nail the shoe was lost.",
"For want of a shoe the horse was lost.",
"And all for the want of a nail.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);

[2.12676]

[2.12962]

let input = vec!["nail", "shoe", "horse"];
let expected = vec![
"For want of a nail the shoe was lost.",
"For want of a shoe the horse was lost.",
"And all for the want of a nail.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);
replacement in rust/proverb/tests/proverb.rs at line 31

[2.13005]→[2.13005:13152](∅→∅)

let input = vec!["nail"];
let expected = String::from("And all for the want of a nail.");
assert_eq!(build_proverb(&input), expected);

[2.13005]

[2.13152]

let input = vec!["nail"];
let expected = String::from("And all for the want of a nail.");
assert_eq!(build_proverb(&input), expected);
replacement in rust/proverb/tests/proverb.rs at line 39

[2.13197]→[2.13197:13315](∅→∅)

let input: Vec<&str> = vec![];
let expected = String::new();
assert_eq!(build_proverb(&input), expected);

[2.13197]

[2.13315]

let input: Vec<&str> = vec![];
let expected = String::new();
assert_eq!(build_proverb(&input), expected);
replacement in rust/proverb/tests/proverb.rs at line 47

[2.13353]→[2.13353:13907](∅→∅)

let input = vec![
"nail", "shoe", "horse", "rider", "message", "battle", "kingdom",
];
let expected = vec![
"For want of a nail the shoe was lost.",
"For want of a shoe the horse was lost.",
"For want of a horse the rider was lost.",
"For want of a rider the message was lost.",
"For want of a message the battle was lost.",
"For want of a battle the kingdom was lost.",
"And all for the want of a nail.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);

[2.13353]

[2.13907]

let input = vec![
"nail", "shoe", "horse", "rider", "message", "battle", "kingdom",
];
let expected = vec![
"For want of a nail the shoe was lost.",
"For want of a shoe the horse was lost.",
"For want of a horse the rider was lost.",
"For want of a rider the message was lost.",
"For want of a message the battle was lost.",
"For want of a battle the kingdom was lost.",
"And all for the want of a nail.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);
replacement in rust/proverb/tests/proverb.rs at line 66

[2.13964]→[2.13964:14312](∅→∅)

let input = vec!["pin", "gun", "soldier", "battle"];
let expected = vec![
"For want of a pin the gun was lost.",
"For want of a gun the soldier was lost.",
"For want of a soldier the battle was lost.",
"And all for the want of a pin.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);

[2.13964]

[2.14312]

let input = vec!["pin", "gun", "soldier", "battle"];
let expected = vec![
"For want of a pin the gun was lost.",
"For want of a gun the soldier was lost.",
"For want of a soldier the battle was lost.",
"And all for the want of a pin.",
]
.join("\n");
assert_eq!(build_proverb(&input), expected);
replacement in rust/proverb/src/lib.rs at line 2

[2.14411]→[2.14411:14485](∅→∅)

unimplemented!("build a proverb from this list of items: {:?}", list)

[2.14411]

[2.14485]

match list.first() {
Some(first) => list
.windows(2)
.map(|window| format!("For want of a {} the {} was lost.\n", window[0], window[1]))
.chain(std::iter::once(format!(
"And all for the want of a {}.",
first
)))
.collect(),
_ => String::new(),
}