useSetOrganizeArray.md

let array = [ 
  {hash: "11223344", value: "abc"},
  {hash: "11223344", value: "def"},
  {hash: "22113344", value: "jkl"},
  {hash: "22113344", value: "zyw"},
  {hash: "33221144", value: "omn"},
  {hash: "33221144", value: "xyz"}
];

let a = [...new Set(array.map(i => i.hash))]
  .map(hash => {
    return { hash, values: array.filter(v => v.hash == hash).map(v => v.value) }
  })

console.log(a)