Method arrayproto_copyWithin

builtin_array.go:1045–1083

(call FunctionCall)

}

func (r *Runtime) arrayproto_copyWithin(call FunctionCall) Value {
	o := call.This.ToObject(r)
	l := toLength(o.self.getStr("length", nil))
	var relEnd, dir int64
	to := relToIdx(call.Argument(0).ToInteger(), l)
	from := relToIdx(call.Argument(1).ToInteger(), l)
	if end := call.Argument(2); end != _undefined {
		relEnd = end.ToInteger()
	} else {
		relEnd = l
	}
	final := relToIdx(relEnd, l)
	count := min(final-from, l-to)
	if arr := r.checkStdArrayObj(o); arr != nil {
		if count > 0 {
			copy(arr.values[to:to+count], arr.values[from:from+count])
		}
		return o
	}
	if from < to && to < from+count {
		dir = -1
		from = from + count - 1
		to = to + count - 1
	} else {
		dir = 1
	}
	for count > 0 {
		if o.self.hasPropertyIdx(valueInt(from)) {
			o.self.setOwnIdx(valueInt(to), nilSafe(o.self.getIdx(valueInt(from), nil)), true)
		} else {
			o.self.deleteIdx(valueInt(to), true)
		}
		from += dir
		to += dir
		count--
	}

	return o
}

func (r *Runtime) arrayproto_entries(call FunctionCall) Value {
	return r.createArrayIterator(call.This.ToObject(r), iterationKindKeyValue)