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LibJS: Add Array.prototype.filter()

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Linus Groh 2020-04-13 19:47:19 +01:00 • committed by Andreas Kling
parent 866172a721
commit f03d005bc4
3 changed files with 89 additions and 0 deletions
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27
Libraries/LibJS/Runtime/ArrayPrototype.cpp
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@ -39,6 +39,7 @@ namespace JS {
ArrayPrototype::ArrayPrototype()
{
put_native_function("filter", filter, 1);
put_native_function("forEach", for_each, 1);
put_native_function("pop", pop, 0);
put_native_function("push", push, 1);
@ -78,6 +79,32 @@ static Function* callback_from_args(Interpreter& interpreter, const String& name
return static_cast<Function*>(&callback.as_object());
}
Value ArrayPrototype::filter(Interpreter& interpreter)
{
auto* array = array_from(interpreter);
if (!array)
return {};
auto* callback = callback_from_args(interpreter, "filter");
if (!callback)
return {};
auto this_value = interpreter.argument(1);
auto initial_array_size = array->elements().size();
auto* new_array = interpreter.heap().allocate<Array>();
for (size_t i = 0; i < initial_array_size; ++i) {
if (i >= array->elements().size())
break;
auto value = array->elements()[i];
if (value.is_empty())
continue;
auto result = interpreter.call(callback, this_value, { value, Value((i32)i), array });
if (interpreter.exception())
return {};
if (result.to_boolean())
new_array->elements().append(value);
}
return Value(new_array);
}
Value ArrayPrototype::for_each(Interpreter& interpreter)
{
auto* array = array_from(interpreter);

1
Libraries/LibJS/Runtime/ArrayPrototype.h
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@ -39,6 +39,7 @@ public:
private:
virtual const char* class_name() const override { return "ArrayPrototype"; }
static Value filter(Interpreter&);
static Value for_each(Interpreter&);
static Value pop(Interpreter&);
static Value push(Interpreter&);