const array = [
    {
        username: "john",
        team: "red",
        score: 5,
        items: ["ball", "book", "pen"]
    },
    {
        username: "becky",
        team: "blue",
        score: 10,
        items: ["tape", "backpack", "pen"]
    },
    {
        username: "susy",
        team: "red",
        score: 55,
        items: ["ball", "eraser", "pen"]
    },
    {
        username: "tyson",
        team: "green",
        score: 1,
        items: ["book", "pen"]
    },

];

using this array ,reate an array using forEach that has all the usernames with a "!" to each of the usernames:

let newArray = []
array.forEach(user => {
    let { username } = user;
    username = username + "!";
    newArray.push(username);
})

console.log(newArray);

i couldnt understand this syntax. i mean why did we use {} after let ?