MyxvmR

MyxvmR.markdown

MyxvmR

A Pen by Yuriy on CodePen.

License.

script.js

var bbb = [1,1,1,1,2,2,3,3,3,3,4,4,5,5,7,7,7,7].filter(function(element, index, array) {
  switch (true) {
    case (array.lastIndexOf(element) - array.indexOf(element) > 1):
      // there are more than 2 such elements
      return false;
    case (array.indexOf(element) === index):
      // there are 1 or 2 such elements
      return true;
    default:
      return false;
  }
});

console.log(bbb);