Add length to ordinary functions and arrow functions

boa/src/builtins/value/mod.rs

@@ -480,7 +480,7 @@ impl ValueData {
     }
 
     /// Set the field in the value
-    pub fn set_field_slice<'a>(&self, field: &'a str, val: Value) -> Value {
+    pub fn set_field_slice(&self, field: &str, val: Value) -> Value {
         // set_field used to accept strings, but now Symbols accept it needs to accept a value
         // So this function will now need to Box strings back into values (at least for now)
         let f = Gc::new(Self::String(field.to_string()));
@@ -513,7 +513,7 @@ impl ValueData {
     }
 
     /// Set the property in the value
-    pub fn set_prop_slice<'t>(&self, field: &'t str, prop: Property) -> Property {
+    pub fn set_prop_slice(&self, field: &str, prop: Property) -> Property {
         self.set_prop(field.to_string(), prop)
     }
 

boa/src/exec/mod.rs

@@ -270,6 +270,7 @@ impl Executor for Interpreter {
                 let mut new_func = Object::function();
                 new_func.set_call(func);
                 let val = to_value(new_func);
+                val.set_field_slice("length", to_value(args.len()));
 
                 // Set the name and assign it in the current environment
                 if name.is_some() {
@@ -307,6 +308,7 @@ impl Executor for Interpreter {
                 let mut new_func = Object::function();
                 new_func.set_call(func);
                 let val = to_value(new_func);
+                val.set_field_slice("length", to_value(args.len()));
 
                 Ok(val)
             }

boa/src/realm.rs

@@ -20,7 +20,8 @@ use crate::{
 use gc::{Gc, GcCell};
 use std::collections::{hash_map::HashMap, hash_set::HashSet};
 
-/// Representation of a Realm.   
+/// Representation of a Realm.
+///
 /// In the specification these are called Realm Records.
 #[derive(Debug)]
 pub struct Realm {