Merge pull request #12 from sscdotopen/master

idiomatic collect() in map.rs

Author: frankmcsherry

src/map.rs

@@ -5,13 +5,13 @@ use super::{Variable, Relation};
 pub fn map_into<T1: Ord, T2: Ord>(
     input: &Variable<T1>,
     output: &Variable<T2>,
-    mut logic: impl FnMut(&T1)->T2) {
+    logic: impl FnMut(&T1)->T2) {
 
-    let mut results = Vec::new();
-    let recent = input.recent.borrow();
-    for tuple in recent.iter() {
-        results.push(logic(tuple));
-    }
+    let results: Vec<T2> = input.recent
+        .borrow()
+        .iter()
+        .map(logic)
+        .collect();
 
     output.insert(Relation::from_vec(results));
 }