Having difficulty applying a filter to an array following the deletion of an element in a class method

Question

Having difficulty applying a filter to an array following the deletion of an element in a class method

I'm having trouble filtering my array using a filter function. I need to get an updated, filtered array. If there is a way to improve the code, please advise on what changes can be made.

class Store {
  constructor(items) {
    this._items = items;
  }
  getItems() {
    return this._items;
  }
  addItem(item) {
    this._items.push(item); 
    return this._items;
  }
  removeItem(item) {
    this._items = this._items.filter(value => value != item);
    return this._items;
  }
}

let storage = new Store([
  'Cubbage',
  'Garlice',
  'Sauce',
  'Tomato',
]);

let items = storage.getItems(); 
console.table(items);

storage.addItem('banana'); 
console.table(items);

storage.removeItem('Tomato');
console.table(items); //

javascript arrays oop filter

Answer 1

Answer №1

The filter() method generates a fresh array containing only elements that pass the specified function's test.

In order to do this, you can either assign the value of this._items as follows:

removeItem(item) {
    this._items = this._items.filter(value => value != item);
    return this._items;
}

Alternatively, you can directly return the result of this._items.filter() like so:

removeItem(item) {
    return this._items.filter(value => value != item);
}

class Store {
  constructor(items) {
    this._items = items;
  }
  getItems() {
    return this._items;
  }
  addItem(item) {
    this._items.push(item);
    return this._items;
  }
  removeItem(item) {
    this._items = this._items.filter(value => value != item);
    return this._items;
  }
}

let storage = new Store(['Cubbage','Garlice','Sauce','Tomato']);

storage.addItem('banana');
let items = storage.removeItem('Tomato');
console.log(items); //

Answer 2

The filter() method generates a fresh array containing only elements that pass the specified function's test.

In order to do this, you can either assign the value of this._items as follows:

removeItem(item) {
    this._items = this._items.filter(value => value != item);
    return this._items;
}

Alternatively, you can directly return the result of this._items.filter() like so:

removeItem(item) {
    return this._items.filter(value => value != item);
}

class Store {
  constructor(items) {
    this._items = items;
  }
  getItems() {
    return this._items;
  }
  addItem(item) {
    this._items.push(item);
    return this._items;
  }
  removeItem(item) {
    this._items = this._items.filter(value => value != item);
    return this._items;
  }
}

let storage = new Store(['Cubbage','Garlice','Sauce','Tomato']);

storage.addItem('banana');
let items = storage.removeItem('Tomato');
console.log(items); //

Answer 3

Answer №2

When using .filter(), it's important to remember that it doesn't modify the original array, but instead creates a new one. Make sure to assign the result back to your array.

this._items = this._items.filter(value => value != item);

Alternatively, you can remove a single item from an array using .splice().

removeItem(item) {
    this._items.splice(this._items.indexOf(item), 1);
    return this._items;
}

Answer 4

When using .filter(), it's important to remember that it doesn't modify the original array, but instead creates a new one. Make sure to assign the result back to your array.

this._items = this._items.filter(value => value != item);

Alternatively, you can remove a single item from an array using .splice().

removeItem(item) {
    this._items.splice(this._items.indexOf(item), 1);
    return this._items;
}

Answer 5

Answer №3

.filter creates a fresh array, without altering the original one. Give this a shot:

class Warehouse {
    constructor(products) {
      this._products = products;
    }
    getProducts() {
      return this._products;
    }
    addProduct(product) {
      this._products.push(product);
      return this._products;
    }
    removeProduct(product) {
      const updatedList = this._products.filter(value => value != product);
      return updatedList;
    }
  }

  let inventory = new Warehouse([
    'Apples',
    'Oranges',
    'Bananas',
    'Berries',
  ]);

  let stock = inventory.getProducts();
  console.table(stock);

  inventory.addProduct('Grapes');
  console.table(stock);

  inventory.removeProduct('Bananas');
  console.table(stock);

Answer 6

.filter creates a fresh array, without altering the original one. Give this a shot:

class Warehouse {
    constructor(products) {
      this._products = products;
    }
    getProducts() {
      return this._products;
    }
    addProduct(product) {
      this._products.push(product);
      return this._products;
    }
    removeProduct(product) {
      const updatedList = this._products.filter(value => value != product);
      return updatedList;
    }
  }

  let inventory = new Warehouse([
    'Apples',
    'Oranges',
    'Bananas',
    'Berries',
  ]);

  let stock = inventory.getProducts();
  console.table(stock);

  inventory.addProduct('Grapes');
  console.table(stock);

  inventory.removeProduct('Bananas');
  console.table(stock);

Having difficulty applying a filter to an array following the deletion of an element in a class method

Answer №1

Answer №2

Answer №3

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