From afff22830862d8812880ec92d37031a56ef799d8 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 5 Apr 2020 00:26:56 +0200
Subject: [PATCH] LibJS: Add Math.floor()

---
 Libraries/LibJS/Runtime/MathObject.cpp | 12 ++++++++++++
 Libraries/LibJS/Runtime/MathObject.h   |  1 +
 2 files changed, 13 insertions(+)

diff --git a/Libraries/LibJS/Runtime/MathObject.cpp b/Libraries/LibJS/Runtime/MathObject.cpp
index 2871feef99..00425bf4c4 100644
--- a/Libraries/LibJS/Runtime/MathObject.cpp
+++ b/Libraries/LibJS/Runtime/MathObject.cpp
@@ -37,6 +37,7 @@ MathObject::MathObject()
     put_native_function("abs", abs, 1);
     put_native_function("random", random);
     put_native_function("sqrt", sqrt, 1);
+    put_native_function("floor", floor, 1);
 
     put("E", Value(M_E));
     put("LN2", Value(M_LN2));
@@ -84,4 +85,15 @@ Value MathObject::sqrt(Interpreter& interpreter)
     return Value(::sqrt(number.as_double()));
 }
 
+Value MathObject::floor(Interpreter& interpreter)
+{
+    if (!interpreter.argument_count())
+        return js_nan();
+
+    auto number = interpreter.argument(0).to_number();
+    if (number.is_nan())
+        return js_nan();
+    return Value(::floor(number.as_double()));
+}
+
 }
diff --git a/Libraries/LibJS/Runtime/MathObject.h b/Libraries/LibJS/Runtime/MathObject.h
index 21f6130e75..6e11daf627 100644
--- a/Libraries/LibJS/Runtime/MathObject.h
+++ b/Libraries/LibJS/Runtime/MathObject.h
@@ -41,6 +41,7 @@ private:
     static Value abs(Interpreter&);
     static Value random(Interpreter&);
     static Value sqrt(Interpreter&);
+    static Value floor(Interpreter&);
 };
 
 }