diff options
Diffstat (limited to 'Userland/Libraries/LibJS/Runtime/BigIntConstructor.cpp')
| -rw-r--r-- | Userland/Libraries/LibJS/Runtime/BigIntConstructor.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/Userland/Libraries/LibJS/Runtime/BigIntConstructor.cpp b/Userland/Libraries/LibJS/Runtime/BigIntConstructor.cpp index fd64dbb141..075899b960 100644 --- a/Userland/Libraries/LibJS/Runtime/BigIntConstructor.cpp +++ b/Userland/Libraries/LibJS/Runtime/BigIntConstructor.cpp @@ -32,7 +32,7 @@ void BigIntConstructor::initialize(GlobalObject& global_object) u8 attr = Attribute::Writable | Attribute::Configurable; define_native_function(vm.names.asIntN, as_int_n, 2, attr); - // define_native_function(vm.names.asUintN, as_uint_n, 2, attr); + define_native_function(vm.names.asUintN, as_uint_n, 2, attr); define_direct_property(vm.names.length, Value(1), Attribute::Configurable); } @@ -95,7 +95,16 @@ JS_DEFINE_NATIVE_FUNCTION(BigIntConstructor::as_int_n) // 21.2.2.2 BigInt.asUintN ( bits, bigint ), https://tc39.es/ecma262/#sec-bigint.asuintn JS_DEFINE_NATIVE_FUNCTION(BigIntConstructor::as_uint_n) { - TODO(); + // 1. Set bits to ? ToIndex(bits). + auto bits = TRY(vm.argument(0).to_index(global_object)); + + // 2. Set bigint to ? ToBigInt(bigint). + auto* bigint = TRY(vm.argument(1).to_bigint(global_object)); + + // 3. Return the BigInt value that represents ℝ(bigint) modulo 2bits. + // FIXME: For large values of `bits`, this can likely be improved with a SignedBigInteger API to + // drop the most significant bits. + return js_bigint(vm, modulo(bigint->big_integer(), BIGINT_ONE.shift_left(bits))); } } |