I want to group the array by a specific key and display its sum at the end of each group.

Example:

var array = [
  { name: "Naruto", qty: 5 },
  { name: "Sasuke", qty: 2 },
  { name: "Naruto", qty: 2 },
  { name: "Hinata", qty: 4 },
  { name: "Sasuke", qty: 4 },
]

Expected Result:

[
// naruto's group
  { name: "Naruto", qty: 5 },
  { name: "Naruto", qty: 2 },
  { name: "Total", qty: 7 },

// sasuke's group
  { name: "Sasuke", qty: 2 },
  { name: "Sasuke", qty: 4 },
  { name: "Total", qty: 6 },

// hinata's group
  { name: "Hinata", qty: 4 },
  { name: "Total", qty: 4 },

]