According to an article in the Las Vegas RJ, Nevada state law supercedes association bylaws whenever there is a conflict. Conflicts often arise regarding budget, rights, and other accepted bylaws. HOA bylaws are typically established by a builder but accepted and maintained by the residents of the community. In Las Vegas communities HOAs are common, especially in newer neighborhoods.
Many appreciate HOAs and some don't. The benefit to Las Vegas real estate is buyers can find what they want. A Las Vegas real estate agent or Realtor can help you determine whether a community has an HOA or not.