Initial Commit

2026-06-19 12:54:57 -04:00
parent e87e12db90
commit e9afcd2dd0
7 changed files with 824 additions and 0 deletions
@@ -0,0 +1,48 @@
+use rayon::prelude::*;
+use std::collections::HashMap;
+
+pub fn char_frequencies(lines: &[String]) -> HashMap<char, u64> {
+    lines
+        .par_iter()
+        .fold(
+            HashMap::new,
+            |mut freqs: HashMap<_, _>, line: &String| {
+                for ch in line.chars() {
+                    *freqs.entry(ch).or_insert(0) += 1;
+                }
+                freqs
+            },
+        )
+        .reduce(
+            HashMap::new,
+            |mut freqs1, freqs2| {
+                freqs2
+                    .into_iter()
+                    .for_each(|(ch, n)| *freqs1.entry(ch).or_insert(0) += n);
+                freqs1
+            },
+        )
+}
+
+pub fn word_frequencies(lines: &[String]) -> HashMap<String, u64> {
+    lines
+        .par_iter()
+        .fold(
+            HashMap::new,
+            |mut freqs: HashMap<_, _>, line: &String| {
+                for word in line.split_ascii_whitespace() {
+                    *freqs.entry(word.to_string()).or_insert(0) += 1;
+                }
+                freqs
+            },
+        )
+        .reduce(
+            HashMap::new,
+            |mut freqs1, freqs2| {
+                freqs2
+                    .into_iter()
+                    .for_each(|(word, n)| *freqs1.entry(word).or_insert(0) += n);
+                freqs1
+            },
+        )
+}