Detecting repeated property values within a collection of embedded objects

Question

Detecting repeated property values within a collection of embedded objects

I am currently working with a JSON file that contains an array of nested objects and arrays to represent a shopping cart. My goal is to identify duplicate values and update the quantity of the item if duplicates exist, otherwise simply add the items to the cart.

Below is the content of the JSON file:

[
    {
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="93e7e0fbf6e3fcd3f6fef2faffbdf0fcfe">[email protected]</a>",
        "status": "OPEN",
        "items": [
            {
                "name": "hamster",
                "quantity": 2,
                "price": 20
            },
            {
                "name": "saw dust",
                "quantity": 1,
                "price": 20
            },
            {
                "name": "hamster-cage",
                "quantity": 1,
                "price": 150
            },
            {
                "name": "book: how to care for your hamster",
                "quantity": 1,
                "price": 150
            },
            {
                "name": "hamster-cage",
                "quantity": 1,
                "price": 150
            }
        ]
    }
]

Here is an overview of what I have implemented so far:

const data = require("./data.json");

function checkIfPresent(key){
    let ans = data.findIndex((obj) => Object.values(obj).includes(key))
    return ans;
}

for(let x = 0; x < data.length; x++)
{
    let arr;
    if(checkIfPresent(data[x].items)){
        arr[ans].quantity += data[x].items.quantity;
    }else{
        arr.push(data[x].items);
    }
}

I am facing issues with the functionality of the code and would appreciate any assistance to resolve it.

javascript json nested-object

Answer 1

Answer №1

After reviewing your code, I noticed several errors that needed to be addressed. One key issue was the handling of an array containing a single object with an "items" member that is also an array. This required referencing the items using data[0].items[x] instead of data[x]. Additionally, the checkIfPresent function was incorrectly checking for the presence of the entire object in the array instead of checking for a specific value. It was critical to check if the item name was already processed by examining the arr array. Moreover, the loop initialization was resetting the array in each iteration, preventing access to previous data. To solve this, I moved the initialization outside the loop. Furthermore, since the data array contained multiple shopping instances, it was necessary to wrap another loop around the existing one to iterate over the main index of data.

let data = [
    {
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="bbcfc8d3decbd4fbded6dad2d795d8d4d6">[email protected]</a>",
        "status": "OPEN",
        "items": [
            {
                "name": "hamster",
                "quantity": 2,
                "price": 20
            },
            {
                "name": "saw dust",
                "quantity": 1,
                "price": 20
            },
            {
                "name": "hamster-cage",
                "quantity": 1,
                "price": 150
            },
            {
                "name": "book: how to care for your hamster",
                "quantity": 1,
                "price": 150
            },
            {
                "name": "hamster-cage",
                "quantity": 1,
                "price": 150
            }
        ]
    }
]
function checkIfPresent(key, array){
    let ans = array.findIndex((obj) => obj.name === key)
    return ans;
}

let arr = [];var ans;
for(let x = 0; x < data[0].items.length; x++)
{
    if((ans = checkIfPresent(data[0].items[x].name, arr)) >= 0){
        arr[ans].quantity += data[0].items[x].quantity;
    }else{
        arr.push(data[0].items[x]);
    }
}
console.log(arr);

Answer 2

After reviewing your code, I noticed several errors that needed to be addressed. One key issue was the handling of an array containing a single object with an "items" member that is also an array. This required referencing the items using data[0].items[x] instead of data[x]. Additionally, the checkIfPresent function was incorrectly checking for the presence of the entire object in the array instead of checking for a specific value. It was critical to check if the item name was already processed by examining the arr array. Moreover, the loop initialization was resetting the array in each iteration, preventing access to previous data. To solve this, I moved the initialization outside the loop. Furthermore, since the data array contained multiple shopping instances, it was necessary to wrap another loop around the existing one to iterate over the main index of data.

let data = [
    {
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="bbcfc8d3decbd4fbded6dad2d795d8d4d6">[email protected]</a>",
        "status": "OPEN",
        "items": [
            {
                "name": "hamster",
                "quantity": 2,
                "price": 20
            },
            {
                "name": "saw dust",
                "quantity": 1,
                "price": 20
            },
            {
                "name": "hamster-cage",
                "quantity": 1,
                "price": 150
            },
            {
                "name": "book: how to care for your hamster",
                "quantity": 1,
                "price": 150
            },
            {
                "name": "hamster-cage",
                "quantity": 1,
                "price": 150
            }
        ]
    }
]
function checkIfPresent(key, array){
    let ans = array.findIndex((obj) => obj.name === key)
    return ans;
}

let arr = [];var ans;
for(let x = 0; x < data[0].items.length; x++)
{
    if((ans = checkIfPresent(data[0].items[x].name, arr)) >= 0){
        arr[ans].quantity += data[0].items[x].quantity;
    }else{
        arr.push(data[0].items[x]);
    }
}
console.log(arr);

Detecting repeated property values within a collection of embedded objects

Answer №1

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