redundant variables

redundant-variables-bad.ts

getBackgroundArt(track: Track): BackgroundImage {
 switch(track.getGenre()) {
   case "hiphop":
     const hipHopImage: BackgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/Qcl98B8Bk3I'};
     return hipHopImage;
   case "jazz":
     const jazzImage : BackgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/dBWvUqBoOU8'};
     return jazzImage;
   case "rap":
     const rapImage : BackgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/auq_QbyIA34'};
     return rapImage;
   case "country":
     const countryImage: BackgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/RnFgs90NEHY'};
     return countryImage;
   default:
     const defaultImage: BackgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/PDX_a_82obo'};
     return defaultImage;
 }
}

redundant-variables-good.ts

getBackgroundArt(track: Track): BackgroundImage {
 let backgroundImage: BackgroundImage;
 switch(track.getGenre()) {
   case "hiphop":
     backgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/Qcl98B8Bk3I'};
     break;
   case "jazz":
     backgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/dBWvUqBoOU8'};
     break;
   case "rap":
     backgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/auq_QbyIA34'};
     break;
   case "country":
     backgroundImage = {dimension: 'small', 'url': 'https://unsplash.com/photos/RnFgs90NEHY'};
     break;
   default:
     backgroundImage = {dimension: 'small', url : 'https://unsplash.com/photos/PDX_a_82obo'};
 }
 return backgroundImage;
}