switch-case.js

function test(arg){
  switch (true) {
    case arg === 'test': {
      const value = 'a';
      return 'it was test';
    }
    case art === 'foo': {
      const value = 'b';
      return 'it was foo';
    }
    default:
       return 'no match';
  }
}

console.log(test('test'));