如何在对象数组中添加、更新、删除和搜索 object

Question

Hello I have an empty array, then I push inside objects, but is not getting updated, it going back to empty again. this on node.js. i need to get as the first argument - from the commend line one of three string that do something to the array: 'add' to add new item to the array, 'delete' for delete frm the array and and 'update' for update the array. second argument is name of the book,third argument author, and last arugmnt pages.

    let arrayOfBooks = [];

// Assign places to the array 
let whichArgument = process.argv[2]
let name = process.argv[3];
let author = process.argv[4];
let pages = Number(process.argv[5]);

// Function constructor
function Book(name,author,pages) {
    this.name = name;
    this.author = author;
    this.pages = pages;
}

// Add function
const addBook = (arrayOfBooks)=> {
    arrayOfBooks.push(new Book(name, author, pages));
    return arrayOfBooks
}
let result = addBook(arrayOfBooks);

Answer 1

Your method works, but maybe you are loosing the reference by using the same name to the array and the params. But anyway, as the method .push does not return an updated array, just it modifies the same array instance, you don't need to return the pushed array, just use it.

const arrayOfBooks = [
    {book: 1},
  {book: 2},
  {book: 3},
  {book: 4},
]

const addBook = (list, book) => {
    list.push(book)
}

addBook(arrayOfBooks, {book: 5, isTheNewOne: true})

const result = arrayOfBooks
console.log(result)
// Array with 5 elements now

See in fiddle