How can I manipulate variables inside - map.set(key, Object.assign({}, item));.

Array for example -

const arr = [
        {
          name: "daniel",
          sum: "$100",
        },
        {
          name: "daniel",
          sum: "100",
        },
        {
          name: "daniel",
          sum: "$100",
        },
        {
          name: "daniel",
          sum: "100",
        },
      ];

desired output -

const arr = [
    {
      name: "daniel",
      sum: "100",
    },
    {
      name: "daniel",
      sum: "100",
    },
    {
      name: "daniel",
      sum: "100",
    },
    {
      name: "daniel",
      sum: "100",
    },
  ];

How can I split for the example inside the assign?