[SuperZen]

var size = "a7" // toUpperCase
  var density = "120"
  var type = "2"; // значит нужен массив a71202.

  const base = {
    A78010: [1, 2, 3],
    A71202: [2, 3, 4],
    A68010: [3, 4, 5],
    A61202: [4, 5, 6],
  }
  console.log(base[`${size.toUpperCase()}${density}${type}`]) // [2, 3, 4]