Merge both arrays together following the application of the filter technique

Question

Merge both arrays together following the application of the filter technique

Having trouble displaying the cart page showcasing the products added by users. I have two arrays: one containing product details and another with cart product details showing product IDs and quantities selected by users.

productDetails: [
            {
              productID: 1,
              productTitle: 'Product Title 1',
              productPrice: 2000
            },
            {
              productID: 2,
              productTitle: 'Product Title 2',
              productPrice: 5000
            },
            {
              productID: 3,
              productTitle: 'Product Title 3',
              productPrice: 1000
            },
            {
              productID: 4,
              productTitle: 'Product Title 4',
              productPrice: 10000
            }
          ],

CartProducts array contains:

cartProducts: [
            {
              productID: 1,
              quantity: 5,
            },
            {
              productID: 3,
              quantity: 2,
            }
          ]

I have successfully filtered all the products that the user has selected. Function below provides the details of products with ID 1 and 3, but now I want to merge this information into a new array adding the quantity attribute as well.

newArray: [
            {
              productID: 1,
              productTitle: 'Product Title 1',
              productPrice: 2000,
              quantity:5
            },
            {
              productID: 3,
              productTitle: 'Product Title 3',
              productPrice: 1000,
              quantity:5
            }
          ]

I hope my query is clear. I am attempting to solve this using the map method in JavaScript without success.

Best Regards,

javascript arrays dictionary filter

Answer 1

Answer №1

You could apply the map() method following a filter() operation to include a quantity property for each item.

const productDetails = [{ productID: 1, productTitle: 'Product Title 1', productPrice: 2000 }, { productID: 2, productTitle: 'Product Title 2', productPrice: 5000 }, { productID: 3, productTitle: 'Product Title 3', productPrice: 1000 }, { productID: 4, productTitle: 'Product Title 4', productPrice: 10000 }];
const cartProducts = [{ productID: 1, quantity: 5 }, { productID: 3, quantity: 2 }]; 

function updateCartItemDetails() {
  return productDetails
    .filter(el => cartProducts.some(f => f.productID === el.productID))
    .map(item => ({
      ...item,
      "quantity": cartProducts.find(f => f.productID === item.productID).quantity
    }));
}

console.log(updateCartItemDetails());

Alternatively, you may utilize the reduce() function.

const productDetails = [{ productID: 1, productTitle: 'Product Title 1', productPrice: 2000 }, { productID: 2, productTitle: 'Product Title 2', productPrice: 5000 }, { productID: 3, productTitle: 'Product Title 3', productPrice: 1000 }, { productID: 4, productTitle: 'Product Title 4', productPrice: 10000 }];
const cartProducts = [{ productID: 1, quantity: 5 }, { productID: 3, quantity: 2 }]; 

function updateCartItemDetails() {
  return productDetails.reduce((acc, curr) => {
    let item = cartProducts.find(f => f.productID === curr.productID);

    if (item) {
      acc.push({ ...curr,
        "quantity": item.quantity
      });
    }

    return acc;
  }, []);
}

console.log(updateCartItemDetails());

An alternative approach would be using map() directly on cartProducts.

const productDetails = [{ productID: 1, productTitle: 'Product Title 1', productPrice: 2000 }, { productID: 2, productTitle: 'Product Title 2', productPrice: 5000 }, { productID: 3, productTitle: 'Product Title 3', productPrice: 1000 }, { productID: 4, productTitle: 'Product Title 4', productPrice: 10000 }];
const cartProducts = [{ productID: 1, quantity: 5 }, { productID: 3, quantity: 2 }]; 

function updateCartItemDetails() {
  return cartProducts.map(item => ({
    ...productDetails.find(f => f.productID === item.productID),
    ...item
  }));
}

console.log(updateCartItemDetails());

Answer 2

You could apply the map() method following a filter() operation to include a quantity property for each item.

const productDetails = [{ productID: 1, productTitle: 'Product Title 1', productPrice: 2000 }, { productID: 2, productTitle: 'Product Title 2', productPrice: 5000 }, { productID: 3, productTitle: 'Product Title 3', productPrice: 1000 }, { productID: 4, productTitle: 'Product Title 4', productPrice: 10000 }];
const cartProducts = [{ productID: 1, quantity: 5 }, { productID: 3, quantity: 2 }]; 

function updateCartItemDetails() {
  return productDetails
    .filter(el => cartProducts.some(f => f.productID === el.productID))
    .map(item => ({
      ...item,
      "quantity": cartProducts.find(f => f.productID === item.productID).quantity
    }));
}

console.log(updateCartItemDetails());

Alternatively, you may utilize the reduce() function.

const productDetails = [{ productID: 1, productTitle: 'Product Title 1', productPrice: 2000 }, { productID: 2, productTitle: 'Product Title 2', productPrice: 5000 }, { productID: 3, productTitle: 'Product Title 3', productPrice: 1000 }, { productID: 4, productTitle: 'Product Title 4', productPrice: 10000 }];
const cartProducts = [{ productID: 1, quantity: 5 }, { productID: 3, quantity: 2 }]; 

function updateCartItemDetails() {
  return productDetails.reduce((acc, curr) => {
    let item = cartProducts.find(f => f.productID === curr.productID);

    if (item) {
      acc.push({ ...curr,
        "quantity": item.quantity
      });
    }

    return acc;
  }, []);
}

console.log(updateCartItemDetails());

An alternative approach would be using map() directly on cartProducts.

const productDetails = [{ productID: 1, productTitle: 'Product Title 1', productPrice: 2000 }, { productID: 2, productTitle: 'Product Title 2', productPrice: 5000 }, { productID: 3, productTitle: 'Product Title 3', productPrice: 1000 }, { productID: 4, productTitle: 'Product Title 4', productPrice: 10000 }];
const cartProducts = [{ productID: 1, quantity: 5 }, { productID: 3, quantity: 2 }]; 

function updateCartItemDetails() {
  return cartProducts.map(item => ({
    ...productDetails.find(f => f.productID === item.productID),
    ...item
  }));
}

console.log(updateCartItemDetails());

Answer 3

Answer №2

Utilize map and object spread to merge the contents of both arrays:

let mergedArray = cartProducts.map(cart => ({
  ...cart,
  ...productDetails.find(prod => prod.productID === cart.productID)
}));

Answer 4

Utilize map and object spread to merge the contents of both arrays:

let mergedArray = cartProducts.map(cart => ({
  ...cart,
  ...productDetails.find(prod => prod.productID === cart.productID)
}));

Answer 5

Answer №3

Transform the productDetails data into a Map structure called productDetailsMap, where the key is the productID.

Loop through the cartProducts array using Array.map() to retrieve each product from productDetailsMap based on its productID, then merge them by spreading technique into a new object.

const productDetails = [{"productID":1,"productTitle":"Product Title 1","productPrice":2000},{"productID":2,"productTitle":"Product Title 2","productPrice":5000},{"productID":3,"productTitle":"Product Title 3","productPrice":1000},{"productID":4,"productTitle":"Product Title 4","productPrice":10000}]
const cartProducts = [{"productID":1,"quantity":5},{"productID":3,"quantity":2}]

const productDetailsMap = new Map(productDetails.map(o => [o.productID, o]))

const result = cartProducts.map(o => ({
  ...productDetailsMap.get(o.productID),
  ...o
}))

console.log(result)

Answer 6

Transform the productDetails data into a Map structure called productDetailsMap, where the key is the productID.

Loop through the cartProducts array using Array.map() to retrieve each product from productDetailsMap based on its productID, then merge them by spreading technique into a new object.

const productDetails = [{"productID":1,"productTitle":"Product Title 1","productPrice":2000},{"productID":2,"productTitle":"Product Title 2","productPrice":5000},{"productID":3,"productTitle":"Product Title 3","productPrice":1000},{"productID":4,"productTitle":"Product Title 4","productPrice":10000}]
const cartProducts = [{"productID":1,"quantity":5},{"productID":3,"quantity":2}]

const productDetailsMap = new Map(productDetails.map(o => [o.productID, o]))

const result = cartProducts.map(o => ({
  ...productDetailsMap.get(o.productID),
  ...o
}))

console.log(result)

Answer 7

Answer №4

If you're looking for a solution, you might want to consider the following approach:

retrieveCartItemInfo() {
    return this.itemsInCart.map(item => {
         let details = this.itemDetails.find(detail => detail.itemID === item.itemID)
         return {...item, ...details}
    })
}

I hope this suggestion proves useful!

Answer 8

If you're looking for a solution, you might want to consider the following approach:

retrieveCartItemInfo() {
    return this.itemsInCart.map(item => {
         let details = this.itemDetails.find(detail => detail.itemID === item.itemID)
         return {...item, ...details}
    })
}

I hope this suggestion proves useful!

Answer 9

Answer №5

To easily transfer property-value pairs from productDetails to cartProducts based on matching productID, you can utilize the Object.assign() method:

let productDetails = [
            {
              productID: 1,
              productTitle: 'Product Title 1',
              productPrice: 2000
            },
            {
              productID: 2,
              productTitle: 'Product Title 2',
              productPrice: 5000
            },
            {
              productID: 3,
              productTitle: 'Product Title 3',
              productPrice: 1000
            },
            {
              productID: 4,
              productTitle: 'Product Title 4',
              productPrice: 10000
            }
          ];

let cartProducts = [
            {
              productID: 1,
              quantity: 5,
            },
            {
              productID: 3,
              quantity: 2,
            }
          ];
cartProducts.map(cart => Object.assign(cart, productDetails.find(product => product.productID === cart.productID))  )
console.log(cartProducts)

Answer 10

To easily transfer property-value pairs from productDetails to cartProducts based on matching productID, you can utilize the Object.assign() method:

let productDetails = [
            {
              productID: 1,
              productTitle: 'Product Title 1',
              productPrice: 2000
            },
            {
              productID: 2,
              productTitle: 'Product Title 2',
              productPrice: 5000
            },
            {
              productID: 3,
              productTitle: 'Product Title 3',
              productPrice: 1000
            },
            {
              productID: 4,
              productTitle: 'Product Title 4',
              productPrice: 10000
            }
          ];

let cartProducts = [
            {
              productID: 1,
              quantity: 5,
            },
            {
              productID: 3,
              quantity: 2,
            }
          ];
cartProducts.map(cart => Object.assign(cart, productDetails.find(product => product.productID === cart.productID))  )
console.log(cartProducts)

Answer 11

Answer №6

for each cartProduct in cartProducts, find the product details with matching productID
and return an object with the product details and the quantity from cartProduct

Consider adding null checks if necessary.

Answer 12

for each cartProduct in cartProducts, find the product details with matching productID
and return an object with the product details and the quantity from cartProduct

Consider adding null checks if necessary.

Answer 13

Answer №7

Your code is experiencing an issue here:

cartItemDetails() {
      return this.productDetails.filter(
        el => this.cartProducts.some(f => f.id === el.productID),
      );
    },

The variable f, which represents a cartProducts item, does not have an id property.

I believe you intended to use f.productID instead.

Here is a solution for adding the quantity property using the map function :

this.productDetails = cartItemDetails().map((element) => {
  for (let e of this.cartProducts) {
    if (e.productID === element.productID) return {...element, quantity: e.quantity}
  }
})

Answer 14

Your code is experiencing an issue here:

cartItemDetails() {
      return this.productDetails.filter(
        el => this.cartProducts.some(f => f.id === el.productID),
      );
    },

The variable f, which represents a cartProducts item, does not have an id property.

I believe you intended to use f.productID instead.

Here is a solution for adding the quantity property using the map function :

this.productDetails = cartItemDetails().map((element) => {
  for (let e of this.cartProducts) {
    if (e.productID === element.productID) return {...element, quantity: e.quantity}
  }
})

Merge both arrays together following the application of the filter technique

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

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