NOT UNDERSTANDABLE Selecting from many options with Switch Statements

After solving this challenge, I must say it is very poorly explained. I didn’t understood that the phrase after “case” !IS! the strict equation and it takes as an argument, the value of val.
Could you please re-write this challenge to be more understandable?

Your code so far

function caseInSwitch(val) {
  var answer = "";
  // Only change code below this line
  switch (val) {
    case 1:
      answer = "alpha";
    case 2:
      answer = "beta";
    case 3:
      answer = "gamma";
    case 4:
      answer = "delta";
  // Only change code above this line  
  return answer;  

// Change this value to test

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Link to the challenge:

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