Case expressions must be constant-CodePudding

I got this error Case expressions must be constant When I try to use value of the map in switch case

Don't know how to fix it

const map = {'cat': 10, 'dog': 7, 'mouse': 4};


function(animal) {
  switch(animal){
    case map['cat'] {
      print('ok');
    }
    case map['dog']{
      print('not ok');
    }
  }
}

CodePudding user response：

when using switch and case you cant use values which are known only at run time after the "case" keyword

if you want to check if an animal is a dog or cat, and animal is supposed to be a string type, try writing:

function(animal) {
  switch(animal){
    case 'cat':
      print('ok');
      break;

    case 'dog':
      print('not ok');
      break;
  }
}