How can I check whether a given string contains another substring?

How can I check whether a given string contains another substring?

fun isFieldRepeated(jsonIn: String, field:String): Boolean { 
  var count: Int = 0; 
  while (jsonIn.indexOf(field) > -1) { 
       jsonIn = jsonIn.substring(jsonIn.indexOf(field)+field.length(),jsonIn.length()); 
       count++;  
  } 
  if(count>1) 
   return true; 
  return false; 
 }

>Solution :

Are you sure that your code, albeit a bit redundant, doesn’t work?

The following should do what you seemingly want it to, but is a bit cleaner 🙂

fun isFieldRepeated(jsonIn: String, field:String): Boolean { 
    val index: Int =jsonIn.indexOf(field)
    return index!=-1 && jsonIn.indexOf(index, field)!=-1
}

Hope it helps!