LibJS: Add Math.{cos,sin,tan}()

Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/f5dacfbb5bf
Pull-request: https://github.com/SerenityOS/serenity/pull/1659

Libraries/LibJS/Runtime/MathObject.cpp

@@ -43,6 +43,9 @@ MathObject::MathObject()
     put_native_function("max", max, 2);
     put_native_function("min", min, 2);
     put_native_function("trunc", trunc, 1);
+    put_native_function("sin", sin, 1);
+    put_native_function("cos", cos, 1);
+    put_native_function("tan", tan, 1);
 
     put("E", Value(M_E));
     put("LN2", Value(M_LN2));
@@ -152,4 +155,28 @@ Value MathObject::trunc(Interpreter& interpreter)
     return MathObject::floor(interpreter);
 }
 
+Value MathObject::sin(Interpreter& interpreter)
+{
+    auto number = interpreter.argument(0).to_number();
+    if (number.is_nan())
+        return js_nan();
+    return Value(::sin(number.as_double()));
+}
+
+Value MathObject::cos(Interpreter& interpreter)
+{
+    auto number = interpreter.argument(0).to_number();
+    if (number.is_nan())
+        return js_nan();
+    return Value(::cos(number.as_double()));
+}
+
+Value MathObject::tan(Interpreter& interpreter)
+{
+    auto number = interpreter.argument(0).to_number();
+    if (number.is_nan())
+        return js_nan();
+    return Value(::tan(number.as_double()));
+}
+
 }

Libraries/LibJS/Runtime/MathObject.h

@@ -47,6 +47,9 @@ private:
     static Value max(Interpreter&);
     static Value min(Interpreter&);
     static Value trunc(Interpreter&);
+    static Value sin(Interpreter&);
+    static Value cos(Interpreter&);
+    static Value tan(Interpreter&);
 };
 
 }

Libraries/LibJS/Tests/Math.cos.js

@@ -0,0 +1,16 @@
+try {
+    assert(Math.cos(0) === 1);
+    assert(Math.cos(null) === 1);
+    assert(Math.cos('') === 1);
+    assert(Math.cos([]) === 1);
+    assert(Math.cos(Math.PI) === -1);
+    assert(isNaN(Math.cos()));
+    assert(isNaN(Math.cos(undefined)));
+    assert(isNaN(Math.cos([1, 2, 3])));
+    assert(isNaN(Math.cos({})));
+    assert(isNaN(Math.cos("foo")));
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Math.sin.js

@@ -0,0 +1,17 @@
+try {
+    assert(Math.sin(0) === 0);
+    assert(Math.sin(null) === 0);
+    assert(Math.sin('') === 0);
+    assert(Math.sin([]) === 0);
+    assert(Math.sin(Math.PI * 3 / 2) === -1);
+    assert(Math.sin(Math.PI / 2) === 1);
+    assert(isNaN(Math.sin()));
+    assert(isNaN(Math.sin(undefined)));
+    assert(isNaN(Math.sin([1, 2, 3])));
+    assert(isNaN(Math.sin({})));
+    assert(isNaN(Math.sin("foo")));
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/Math.tan.js

@@ -0,0 +1,16 @@
+try {
+    assert(Math.tan(0) === 0);
+    assert(Math.tan(null) === 0);
+    assert(Math.tan('') === 0);
+    assert(Math.tan([]) === 0);
+    assert(Math.ceil(Math.tan(Math.PI / 4)) === 1);
+    assert(isNaN(Math.tan()));
+    assert(isNaN(Math.tan(undefined)));
+    assert(isNaN(Math.tan([1, 2, 3])));
+    assert(isNaN(Math.tan({})));
+    assert(isNaN(Math.tan("foo")));
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}