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LibJS: Add builtin for Math.random()

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Andreas Kling 2025-04-03 12:01:31 +02:00 • committed by Andreas Kling
commit ec590ef3e6
Notes: github-actions[bot] 2025-04-03 11:57:34 +00:00
4 changed files with 22 additions and 13 deletions
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13
Libraries/LibJS/Runtime/MathObject.cpp
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@ -32,7 +32,7 @@ void MathObject::initialize(Realm& realm)
Base::initialize(realm);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(realm, vm.names.abs, abs, 1, attr, Bytecode::Builtin::MathAbs);
define_native_function(realm, vm.names.random, random, 0, attr);
define_native_function(realm, vm.names.random, random, 0, attr, Bytecode::Builtin::MathRandom);
define_native_function(realm, vm.names.sqrt, sqrt, 1, attr, Bytecode::Builtin::MathSqrt);
define_native_function(realm, vm.names.floor, floor, 1, attr, Bytecode::Builtin::MathFloor);
define_native_function(realm, vm.names.ceil, ceil, 1, attr, Bytecode::Builtin::MathCeil);
@ -840,14 +840,19 @@ private:
u64 m_high { 0 };
};
// 21.3.2.27 Math.random ( ), https://tc39.es/ecma262/#sec-math.random
JS_DEFINE_NATIVE_FUNCTION(MathObject::random)
Value MathObject::random_impl()
{
// This function returns a Number value with positive sign, greater than or equal to +0𝔽 but strictly less than 1𝔽,
// chosen randomly or pseudo randomly with approximately uniform distribution over that range, using an
// implementation-defined algorithm or strategy.
static XorShift128PlusPlusRNG rng;
return rng.get();
return Value(rng.get());
}
// 21.3.2.27 Math.random ( ), https://tc39.es/ecma262/#sec-math.random
JS_DEFINE_NATIVE_FUNCTION(MathObject::random)
{
return random_impl();
}
// 21.3.2.28 Math.round ( x ), https://tc39.es/ecma262/#sec-math.round