Add anonymous functionschapter-10-challenges

1 files changed, 40 insertions, 0 deletions

diff --git a/src/com/craftinginterpreters/lox/LoxLambda.java b/src/com/craftinginterpreters/lox/LoxLambda.java
new file mode 100644
index 0000000..8c87460
--- /dev/null
+++ b/src/com/craftinginterpreters/lox/LoxLambda.java
@@ -0,0 +1,40 @@
+package com.craftinginterpreters.lox;
+
+import java.util.List;
+
+class LoxLambda implements LoxCallable {
+    private final Expr.Lambda declaration;
+    private final Environment closure;
+
+    LoxLambda(Expr.Lambda declaration, Environment closure) {
+        this.closure = closure;
+        this.declaration = declaration;
+    }
+
+    @Override
+    public int arity() {
+        return declaration.params.size();
+    }
+
+    @Override
+    public Object call(Interpreter interpreter, List<Object> arguments) {
+        Environment environment = new Environment(closure);
+
+        for (int i = 0; i < declaration.params.size(); i++) {
+            environment.define(declaration.params.get(i).lexeme, arguments.get(i));
+        }
+
+        try {
+            interpreter.executeBlock(declaration.body, environment);
+        } catch (Return returnValue) {
+            return returnValue.value;
+        }
+
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return "<fn anonymous>";
+    }
+}