JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = [{
  class: "second",
  fare: "a"
}, {
  class: "second",
  fare: "b"
}, {
  class: "first",
  fare: "a"
}, {
  class: "first",
  fare: "a"
}, {
  class: "second",
  fare: "a"
}, {
  class: "first",
  fare: "c"
}]
var _unArray = [];
arr.forEach(function(item) {
  var isPresent = _unArray.filter(function(elem) {
    return elem.class === item.class && elem.fare === item.fare
  })
  if (isPresent.length == 0) {
    _unArray.push(item)
  }
})
console.log(_unArray)