JavaScript - простое удаление дублей в массиве [РЕШЕНО] - Флейм

var unique = ['a', 1, 'a', 2, 5, 1].filter(function(value, index, self){return self.indexOf(value) === index});
// ['a', 1, 2, 5]

var arr = ['a', 1, 'a', 2, 5, 1, NaN];
var unique = [...new Set(arr)];
console.log(unique); //Array(5) [ "a", 1, 2, 5, NaN ]
unique = arr.filter(function(value, index, self) {return self.indexOf(value) === index});
console.log(unique); //Array(4) [ "a", 1, 2, 5 ]
var table = {};
unique = arr.filter(function(a) {
  return !table[a] && (table[a] = 1);
});
console.log(unique); //Array(5) [ "a", 1, 2, 5, NaN ]