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LibJS: Implement Math.abs()

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This commit is contained in:
Andreas Kling 2020-03-29 14:56:28 +02:00
parent 2285f84596
commit 2d3634d5f5
4 changed files with 46 additions and 1 deletions
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25
Libraries/LibJS/Runtime/MathObject.cpp
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@ -26,12 +26,15 @@
#include <AK/FlyString.h>
#include <AK/Function.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/MathObject.h>
namespace JS {
MathObject::MathObject()
{
put_native_function("abs", abs);
put_native_function("random", random);
}
@ -39,6 +42,28 @@ MathObject::~MathObject()
{
}
Value MathObject::abs(Interpreter& interpreter)
{
if (interpreter.call_frame().arguments.is_empty())
return js_nan();
auto argument = interpreter.call_frame().arguments[0];
if (argument.is_array()) {
auto& array = *static_cast<const Array*>(argument.as_object());
if (array.length() == 0)
return Value(0);
if (array.length() > 1)
return js_nan();
argument = array.elements()[0];
}
auto number = argument.to_number();
if (number.is_nan())
return js_nan();
return Value(number.as_double() >= 0 ? number.as_double() : -number.as_double());
}
Value MathObject::random(Interpreter&)
{
#ifdef __serenity__