incomplete "pattern matching" in Javascript

condition.js

import * as R from 'ramda';

const condition = R.unapply(R.toString);
const sameAs = condition;

function viewMode (orientation, layoutNo) {
  switch (condition(orientation, layoutNo)) {
    case sameAs('portrait', 2):
      return 'video and description';
    case sameAs('landscape', 1):
    case sameAs('landscape', 2):
      return 'video only';
    default:
      return 'video and description and messages';
  }
}

viewMode('portrait', 1);
// => video and description and messages

viewMode('portrait', 2);
// => video and description

viewMode('landscape', 2);
// => video only