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function createIdGenerator(prefix = "id") {
    let counter = 0;
    return () => `${prefix}-${++counter}`;
}
const generateUserId = createIdGenerator("user");

const user1 = { id: generateUserId(), name: "Alice" };
const user2 = { id: generateUserId(), name: "Bob" };
console.log(user1, user2); // → {id: "user-1"} {id: "user-2"}

function assignIds(items, prefix = "item") {
    const gen = createIdGenerator(prefix);
    return items.map(item => ({ ...item, id: gen() }));
}

const tasks = [{ task: "JS" }, { task: "React" }];
console.log(assignIds(tasks, "task"));
// → [{task:"JS",id:"task-1"}, {task:"React",id:"task-2"}]