search function

function search(searchString) {
 //we test if searchString is empty in that case we just return the original data
 if (typeof searchString !== 'string' || searchString.length === 0) {
 return bands;
 }
 
 //we make search string lower case
 let searchLower = searchString.toLowerCase();
 let filtered = bands.filter(band => {
 if (band.name.toLowerCase().includes(searchLower)) {
 return true;
 }
 
 if (band.description.toLowerCase().includes(searchLower)) {
 return true;
 }
 
 //now we search in albums as well; we store values in an array
 let filteredAlbums = band.albums.filter(album => {
 if (album.name.toLowerCase().includes(searchLower)) {
 return true; //this is a return for albums
 }
 
 return false; //this is a return for albums
 });
 
 if (filteredAlbums.length > 0) {
 return true;
 }
 

 return false;
 })
 
 return filtered;
}