add scrabble solver

Cargo.lock

@@ -37,6 +37,12 @@ version = "0.2.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
 
+[[package]]
+name = "once_cell"
+version = "1.17.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+
 [[package]]
 name = "parens"
 version = "0.1.0"
@@ -81,6 +87,13 @@ dependencies = [
 name = "repeated-groups"
 version = "0.1.0"
 
+[[package]]
+name = "scrabble"
+version = "0.1.0"
+dependencies = [
+ "once_cell",
+]
+
 [[package]]
 name = "scramble"
 version = "0.1.0"

Cargo.toml

@@ -5,5 +5,6 @@ members = [
   "fraction-math",
   "parens",
   "repeated-groups",
+  "scrabble",
   "scramble"
 ]

scrabble/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "scrabble"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+once_cell = "1.17.1"

scrabble/src/main.rs

@@ -0,0 +1,67 @@
+use std::collections::HashMap;
+
+/// Given a string, calculate the score that it would get in a game of Scrabble.
+/// For extra credit, try verifying if the string is a valid word, or take into
+/// account premium squares!
+///
+/// Scoring and example:
+///
+/// 1 point: E, A, I, O, N, R, T, L, S, U
+/// 2 points: D, G
+/// 3 points: B, C, M, P
+/// 4 points: F, H, V, W, Y
+/// 5 points: K
+/// 8 points: J, X
+/// 10 points: Q, Z
+///
+/// ```
+/// > scrabbleScore('FIZZBUZZ')
+/// > 49
+/// ```
+use once_cell::sync::Lazy;
+
+static SCORE_TABLE: Lazy<HashMap<char, usize>> = Lazy::new(|| {
+    let mut m = HashMap::new();
+    m.insert('a', 1);
+    m.insert('b', 3);
+    m.insert('c', 3);
+    m.insert('d', 2);
+    m.insert('e', 1);
+    m.insert('f', 4);
+    m.insert('g', 2);
+    m.insert('h', 4);
+    m.insert('i', 1);
+    m.insert('j', 8);
+    m.insert('k', 5);
+    m.insert('l', 1);
+    m.insert('m', 3);
+    m.insert('n', 1);
+    m.insert('o', 1);
+    m.insert('p', 3);
+    m.insert('q', 10);
+    m.insert('r', 1);
+    m.insert('s', 1);
+    m.insert('t', 1);
+    m.insert('u', 1);
+    m.insert('v', 4);
+    m.insert('w', 4);
+    m.insert('x', 8);
+    m.insert('y', 4);
+    m.insert('z', 10);
+
+    m
+});
+
+fn main() {
+    println!("{}", score_word("FIZZBUZZ".to_string()));
+}
+
+fn score_word(s: String) -> usize {
+    let mut score = 0;
+    for c in s.chars() {
+        let mut c = c;
+        c.make_ascii_lowercase();
+        score += *SCORE_TABLE.get(&c).unwrap_or(&0);
+    }
+    score
+}