Question

I have scala map:

attrs: Map[String , String]

When I try to iterate over map like;

attrs.foreach { key, value =>     }

the above does not work. In each iteration I must know what is the key and what is the value. What is the proper way to iterate over scala map using scala syntactic sugar?

Answer 1

foreach method receives Tuple2[String, String] as argument, not 2 arguments. So you can either use it like tuple:

attrs.foreach {keyVal => println(keyVal._1 + "=" + keyVal._2)}

or you can make pattern match:

attrs.foreach {case(key, value) => ...}