tutorials/rust-book
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Twelve days of christmas improved

Browse Source
This commit is contained in:
Timothy Warren 2019-02-06 12:07:08 -05:00
parent ad04552e39
commit 7a575c7f58
2 changed files with 24 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
twelve_days_of_christmas/Cargo.toml
View File

@ -1,6 +1,6 @@
[package]
name = "twelve_days_of_christmas"
version = "0.1.0"
version = "0.2.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"

57
twelve_days_of_christmas/src/main.rs
View File

@ -1,16 +1,6 @@
const ORDINALS: [&str; 12] = [
"first",
"second",
"third",
"fourth",
"fifth",
"sixth",
"seventh",
"eighth",
"ninth",
"tenth",
"eleventh",
"twelfth",
"first", "second", "third", "fourth", "fifth", "sixth",
"seventh", "eighth", "ninth", "tenth", "eleventh", "twelfth",
];
const GIFTS: [&str; 12] = [
@ -28,31 +18,30 @@ const GIFTS: [&str; 12] = [
"and a partridge in a pear tree.",
];
fn format_verse(day: &str, gifts: &str) -> String {
format!("On the {} day of Christmas, my true love gave to me: \n{}\n", day, gifts)
fn get_gifts(n: usize) -> String {
match n {
0 => String::from("A partridge in a pear tree."),
_ => {
// The highest index is 11, and we want
// the highest index to start, so we can
// easily have the cumulative list each verse.
let gift_index = 11 - n;
// Get the slice of the array of gifts, from
// the index to the end of the array
GIFTS[gift_index..]
.to_vec() // So we have the join method that returns a string
.join(",\n")
}
}
}
fn main() {
for n in 0..12 {
let verse: String = match n {
0 => format_verse("first", "A partridge in a pear tree."),
_ => {
// The highest index is 11, and we want
// the highest index to start, so we can
// easily have the cumulative list each verse.
let gift_index = 11 - n;
// Get the slice of the array of gifts, from
// the index to the end of the array
let gifts = &GIFTS[gift_index..]
.to_vec() // So we have the join method that returns a string
.join(",\n");
format_verse(ORDINALS[n], gifts)
}
};
// For some reason, the println! macro only takes string literals
println!("{}", verse);
println!(
"On the {} day of Christmas, my true love gave to me: \n{}\n",
ORDINALS[n],
get_gifts(n)
);
}
}