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LibJS: Add the Object.fromEntries method

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Idan Horowitz 2021-06-15 12:46:14 +03:00 • committed by Linus Groh
parent 2100b46d02
commit 9a0cbcc3d1
3 changed files with 40 additions and 0 deletions
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38
Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp
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@ -9,6 +9,7 @@
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorOperations.h>
#include <LibJS/Runtime/ObjectConstructor.h>
#include <LibJS/Runtime/ProxyObject.h>
#include <LibJS/Runtime/Shape.h>
@ -44,6 +45,7 @@ void ObjectConstructor::initialize(GlobalObject& global_object)
define_native_function(vm.names.isSealed, is_sealed, 1, attr);
define_native_function(vm.names.preventExtensions, prevent_extensions, 1, attr);
define_native_function(vm.names.freeze, freeze, 1, attr);
define_native_function(vm.names.fromEntries, from_entries, 1, attr);
define_native_function(vm.names.seal, seal, 1, attr);
define_native_function(vm.names.keys, keys, 1, attr);
define_native_function(vm.names.values, values, 1, attr);
@ -182,6 +184,42 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::freeze)
return argument;
}
// 20.1.2.7 Object.fromEntries ( iterable ), https://tc39.es/ecma262/#sec-object.fromentries
JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::from_entries)
{
auto iterable = require_object_coercible(global_object, vm.argument(0));
if (vm.exception())
return {};
auto* object = Object::create_empty(global_object);
object->set_prototype(global_object.object_prototype());
get_iterator_values(global_object, iterable, [&](Value iterator_value) {
if (vm.exception())
return IterationDecision::Break;
if (!iterator_value.is_object()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObject, String::formatted("Iterator value {}", iterator_value.to_string_without_side_effects()));
return IterationDecision::Break;
}
auto key = iterator_value.as_object().get(0).value_or(js_undefined());
if (vm.exception())
return IterationDecision::Break;
auto value = iterator_value.as_object().get(1).value_or(js_undefined());
if (vm.exception())
return IterationDecision::Break;
auto property_key = key.to_property_key(global_object);
if (vm.exception())
return IterationDecision::Break;
object->define_property(property_key, value);
if (vm.exception())
return IterationDecision::Break;
return IterationDecision::Continue;
});
if (vm.exception())
return {};
return object;
}
// 20.1.2.20 Object.seal ( O ), https://tc39.es/ecma262/#sec-object.seal
JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::seal)
{