Getting the parent object based on a filtered nested property can be achieved by utilizing a

Question

Getting the parent object based on a filtered nested property can be achieved by utilizing a

I am currently facing an issue with filtering an array of nested objects. The problem arises when trying to filter the parent object based on a specific property within its child object.

let line = "xyz";

let data = [
    {
        "header": {
            "po_no": "P.O. Number"
        },
        "line": line
    },
    {
        "header": {
            "po_no": "Another P.O. Number"
        },
        "line": line
    }
];

...

data.filter(item => { 
  return item.header.po_no === 'P.O. Number' // This condition should evaluate to true
})

The desired outcome is to retrieve the entire item object when the value of header.po_no matches a certain string.

However, I am encountering difficulties as no values are being returned even when the evaluation conditions are met.

Expected output:

[{
  "header": {
    "po_no": "P.O. Number"
  },
  "line": line
}]

Any suggestions on how I can successfully retrieve the index of the array that meets the criteria of matching a sub-property using a filter?

javascript arrays filter

Answer 1

Answer №1

.filter creates a fresh Array instead of modifying the existing one. Therefore, if you anticipate that data will reflect that result, it won't. However, the following code will achieve the desired outcome:

const expectedItems = data.filter(item => { 
  return item.header.po_no === 'P.O. Number' // This condition returns true
});

Answer 2

.filter creates a fresh Array instead of modifying the existing one. Therefore, if you anticipate that data will reflect that result, it won't. However, the following code will achieve the desired outcome:

const expectedItems = data.filter(item => { 
  return item.header.po_no === 'P.O. Number' // This condition returns true
});

Answer 3

Answer №2

There was a 'quote type error in your code. Filtered information has been stored in a variable.

A string variable called line is set to "xyz".

An array named data contains objects with headers and lines:
1. Header: {po_no: "P.O. Number"}, Line: xyz
2. Header: {po_no: "Another P.O. Number"}, Line: xyz

The const filtered stores items from the data array where header.po_no is equal to 'P.O. Number'.

Answer 4

There was a 'quote type error in your code. Filtered information has been stored in a variable.

A string variable called line is set to "xyz".

An array named data contains objects with headers and lines:
1. Header: {po_no: "P.O. Number"}, Line: xyz
2. Header: {po_no: "Another P.O. Number"}, Line: xyz

The const filtered stores items from the data array where header.po_no is equal to 'P.O. Number'.

Answer 5

Answer №3

Opting for the use of Array.filter along with an arrow function provides a concise solution to this issue. The filter method not only returns the original array but also the filtered items, whereas find would solely return the specific item that was matched.

let line = "xyz";

let data = [{
    "header": { "po_no": "P.O. Number" },
    line
  },
  {
    "header": { "po_no": "Another P.O. Number" },
    line
  }
];

let filter = data.filter(d => d.header.po_no === 'P.O. Number') // returns an array
let find = data.find(d => d.header.po_no === 'P.O. Number') // returns only the matched item

console.log(filter)
console.log(find)

When using arrow functions and directly returning, there is no need to open a function bracket; simply do:

data.filter(d => d.header.po_no === 'P.O. Number')  // <-- no { return ... }

It's worth mentioning that given your property is named line, you can streamline defining your object as:

 {
    "header": { "po_no": "Another P.O. Number" },
    line  // <-- same property name as your variable
  }

Answer 6

Opting for the use of Array.filter along with an arrow function provides a concise solution to this issue. The filter method not only returns the original array but also the filtered items, whereas find would solely return the specific item that was matched.

let line = "xyz";

let data = [{
    "header": { "po_no": "P.O. Number" },
    line
  },
  {
    "header": { "po_no": "Another P.O. Number" },
    line
  }
];

let filter = data.filter(d => d.header.po_no === 'P.O. Number') // returns an array
let find = data.find(d => d.header.po_no === 'P.O. Number') // returns only the matched item

console.log(filter)
console.log(find)

When using arrow functions and directly returning, there is no need to open a function bracket; simply do:

data.filter(d => d.header.po_no === 'P.O. Number')  // <-- no { return ... }

It's worth mentioning that given your property is named line, you can streamline defining your object as:

 {
    "header": { "po_no": "Another P.O. Number" },
    line  // <-- same property name as your variable
  }

Getting the parent object based on a filtered nested property can be achieved by utilizing a

Answer №1

Answer №2

Answer №3

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