[rust] Beer Song

1 files changed, 20 insertions, 0 deletions

diff --git a/beer-song/src/lib.rs b/beer-song/src/lib.rs
new file mode 100644
index 0000000..990fbbf
--- /dev/null
+++ b/beer-song/src/lib.rs
@@ -0,0 +1,20 @@
+use itertools::Itertools;
+
+pub fn verse(n: u32) -> String {
+    match n {
+        0 => format!( "No more bottles of beer on the wall, no more bottles of beer.\n\
+                       Go to the store and buy some more, 99 bottles of beer on the wall.\n"),
+        1 => format!( "1 bottle of beer on the wall, 1 bottle of beer.\n\
+                       Take it down and pass it around, no more bottles of beer on the wall.\n"),
+        2 => format!( "2 bottles of beer on the wall, 2 bottles of beer.\n\
+                       Take one down and pass it around, 1 bottle of beer on the wall.\n"),
+        _ => format!( "{} bottles of beer on the wall, {} bottles of beer.\n\
+                       Take one down and pass it around, {} bottles of beer on the wall.\n",
+                       n, n, n - 1)
+    }
+}
+
+pub fn sing(start: u32, end: u32) -> String {
+    // Note: call to `join` can be substituted with `.intersperse(String::from("\n")).collect()`
+    (end..=start).rev().map(|x| verse(x)).join("\n")
+}