fix print!

assets/prelude.ld

@@ -227,9 +227,10 @@ fn fold {
 	}
 }
 
-& TODO: optimize these with base :conj!
 fn map {
-	"Maps a function over a list: returns a new list with elements that are the result of applying the function to each element in the original list. E.g., `map ([1, 2, 3], inc) &=> [2, 3, 4]`."
+	"Maps a function over a list: returns a new list with elements that are the result of applying the function to each element in the original list. E.g., `map ([1, 2, 3], inc) &=> [2, 3, 4]`. With one argument, returns a function that is a mapper over lists; with two, it executes the mapping function right away."
+	(f as :fn) -> map (f, _)
+	(kw as :keyword) -> map (kw, _)
 	(f as :fn, xs) -> {
 		fn mapper (prev, curr) -> append (prev, f (curr))
 		fold (mapper, xs, [])
@@ -242,6 +243,7 @@ fn map {
 
 fn filter {
 	"Takes a list and a predicate function, and returns a new list with only the items that produce truthy values when the function is called on them. E.g., `filter ([1, 2, 3, 4], odd?) &=> [1, 3]`."
+	(p? as :fn) -> filter (p?, _)
 	(p? as :fn, xs) -> {
 		fn filterer (filtered, x) -> if p? (x)
 			then append (filtered, x)
@@ -256,7 +258,7 @@ fn keep {
 }
 
 fn append {
-	"Adds an element to a list or set."
+	"Adds an element to a list."
 	() -> []
 	(xs as :list) -> xs
 	(xs as :list, x) -> base :conj (xs, x)
@@ -273,7 +275,7 @@ fn append! {
 
 fn concat {
 	"Combines two lists, strings, or sets."
-	(x as :string, y as :string) -> base :concat (x, y)
+	(x as :string, y as :string) -> "{x}{y}"
 	(xs as :list, ys as :list) -> base :concat (xs, ys)
 	& (xs as :set, ys as :set) -> base :concat (xs, ys)
 	(xs, ys, ...zs) -> fold (concat, zs, concat (xs, ys))

src/base.rs

@@ -259,8 +259,15 @@ pub fn or<'src>(x: &Value<'src>, y: &Value<'src>) -> Value<'src> {
 
 // TODO: fix this: x is a list of all the args passed to Ludus's print!
 pub fn print<'src>(x: &Value<'src>) -> Value<'src> {
-    // dbg!(x)
-    println!("{}", x);
+    let Value::List(args) = x else {
+        unreachable!("internal Ludus error")
+    };
+    let out = args
+        .iter()
+        .map(|val| format!("{val}"))
+        .collect::<Vec<_>>()
+        .join("");
+    println!("{out}");
     Value::Keyword("ok")
 }