From 824928050025b89498e3b740d2513fb65e655207 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 13 Apr 2020 17:23:42 +0200
Subject: [PATCH] LibJS: Use HashMap::ensure_capacity() in enter_scope()

Preallocate some space in the scope variable map. This avoids a bunch
of incremental rehashing in the common case.
---
 Libraries/LibJS/Interpreter.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Libraries/LibJS/Interpreter.cpp b/Libraries/LibJS/Interpreter.cpp
index d79b57f2db..22f8489d87 100644
--- a/Libraries/LibJS/Interpreter.cpp
+++ b/Libraries/LibJS/Interpreter.cpp
@@ -92,6 +92,7 @@ Value Interpreter::run(const Statement& statement, ArgumentVector arguments, Sco
 void Interpreter::enter_scope(const ScopeNode& scope_node, ArgumentVector arguments, ScopeType scope_type)
 {
     HashMap<FlyString, Variable> scope_variables_with_declaration_kind;
+    scope_variables_with_declaration_kind.ensure_capacity(16);
 
     for (auto& declaration : scope_node.variables()) {
         for (auto& declarator : declaration.declarations()) {