I have a valid work permit and have been working in Sweden for 6 months. I want to visit the Republic of Ireland. What is the visa requirement for this?
Your Swedish work and residence permit is irrelevant.
To visit the Republic of Ireland as an Indian citizen, you need to obtain a visa in advance. You can find information about how to apply from the Irish embassy in Sweden.
As a visa-national you require a visa to travel to the Republic of Ireland regardless of where you reside, unless you have an in date EUFAM card, or a BIVS visa.
Source Irish Immigration