let R = require("ramda");

let data = [
  {id: "6", manufacturer: "Russia"},
  {id: "5", manufacturer: "USA"},
  {id: "3", manufacturer: "China"},
  {id: "2", manufacturer: "USA"},
  {id: "4", manufacturer: "Russia"},
  {id: "1", manufacturer: "RUSSIA"},
  {id: "1", manufacturer: "Xyz"},
  // {isTrue: true},
];

let pred = R.where({
  id: R.equals(4),
  // manufacturer: R.pipe(R.toLower, R.contains(R.toLower("Rus"))),
  manufacturer: (value) => R.contains(R.toLower("Rus"), R.toLower(value)),
});


let result = R.filter(pred, data);
console.log('result: ', result);