Obtaining a specific value from an array of objects

Question

Obtaining a specific value from an array of objects

I am currently working with an array of objects that contain keys a, b, and c. Key a has a property named property1, key b has properties property1 and property2, and key c has a property called propertycheck. My goal is to retrieve only the key that does not have property1 in it. In this case, I am looking for the output to be c. Any suggestions or assistance would be greatly appreciated as I am stuck at this point.

  [
      {
        "a": {
          "property1": "false"
        }
      },
      {
        "b": {
          "property1": "false",
          "property2": "truthy"
        }
      },
      {
        "c": {
          "propertycheck": "required"
        }
      }
 ]

javascript arrays json typescript object

Answer 1

Answer №1

Below is an implementation where multiple subkeys can be defined for each of the 3 objects.

var arr = [
  {
    "a": {
      "property1": "false"
    }
  },
  {
    "b": {
      "property1": "false",
      "property2": "truthy"
    }
  },
  {
    "c": {
      "propertycheck": "required"
    }
  }
]

var filteredArr = arr.filter(function(elem){   //Filtering operation on each object within the array
  var checkKey = true;                 //checkKey will indicate whether to keep or remove the object
  Object.keys(elem).forEach(function(key){  //Iterating over each key in the object
    if("property1" in elem[key]){           //Checking if the key (object) has property1
      checkKey = false                      //Set checkKey to false to remove the object from the array
    }
  })
  return checkKey
})

–

For more information on Array.filter, visit https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Array/filter

Answer 2

Below is an implementation where multiple subkeys can be defined for each of the 3 objects.

var arr = [
  {
    "a": {
      "property1": "false"
    }
  },
  {
    "b": {
      "property1": "false",
      "property2": "truthy"
    }
  },
  {
    "c": {
      "propertycheck": "required"
    }
  }
]

var filteredArr = arr.filter(function(elem){   //Filtering operation on each object within the array
  var checkKey = true;                 //checkKey will indicate whether to keep or remove the object
  Object.keys(elem).forEach(function(key){  //Iterating over each key in the object
    if("property1" in elem[key]){           //Checking if the key (object) has property1
      checkKey = false                      //Set checkKey to false to remove the object from the array
    }
  })
  return checkKey
})

–

For more information on Array.filter, visit https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Array/filter

Answer 3

Answer №2

Here's how you can achieve it:

d = [
      {
        "a": {
          "property1": "false"
        }
      },
      {
        "b": {
          "property1": "false",
          "property2": "truthy"
        }
      },
      {
        "c": {
          "propertycheck": "required"
        }
      }
]

d.filter(function(x){
   if(!x[Object.keys(x)[0]].hasOwnProperty("property1"))
    {return x}
})

Explanation:

d.filter will loop through the array of objects while applying the filter function
x[Object.keys(x)[0]] is used to dynamically access the key a, b, or c.
.hasOwnProperty("property1") checks if the object contains the key property1.

Answer 4

Here's how you can achieve it:

d = [
      {
        "a": {
          "property1": "false"
        }
      },
      {
        "b": {
          "property1": "false",
          "property2": "truthy"
        }
      },
      {
        "c": {
          "propertycheck": "required"
        }
      }
]

d.filter(function(x){
   if(!x[Object.keys(x)[0]].hasOwnProperty("property1"))
    {return x}
})

Explanation:

d.filter will loop through the array of objects while applying the filter function
x[Object.keys(x)[0]] is used to dynamically access the key a, b, or c.
.hasOwnProperty("property1") checks if the object contains the key property1.

Answer 5

Answer №3

Utilize the hasOwnProperty method to recognize objects containing properties, such as demonstrated in this code snippet that retrieves object 'c'

myArr.filter(obj => !obj.hasOwnProperty(propertyAsString))

Answer 6

Utilize the hasOwnProperty method to recognize objects containing properties, such as demonstrated in this code snippet that retrieves object 'c'

myArr.filter(obj => !obj.hasOwnProperty(propertyAsString))

Obtaining a specific value from an array of objects

Answer №1

Answer №2

Explanation:

Answer №3

Similar questions

If you invoke revokeObjectURL, Chrome will fail to display Blob images

Node module @azure/functions was uninstalled following the deployment of Azure Functions using VSCode

Is the Javascript framework malfunctioning even though the code is identical to the one on jsfiddle

Issue with updating bound property correctly when dynamically generating components using v-for in Vue.js

Get the docx file as a blob

Looking for a way to locate the point where objects intersect in three.js?

What is the syntax for implementing React.forwardRef in a dynamic Anchor or Button component?

What is the process for inserting an array into a datagridview?

The HTTP post method in Angular 2 fails to properly send data to request.JSON within a Grails Action

Creating a fresh discord.js v11.3 channel

attempting to fulfil a promise through a resolution

Interacting with distant servers within XD plugins

Encountering errors with dependency injection in Angular 2 constructors

What causes my Excel file to become corrupted when inputting new data?

Techniques for Utilizing MongoDB Aggregation to Extract Specific Fields from Results

Exploring the power of Typescript alongside Styled Components and Material UI

How to eliminate an element from a PHP array by specifying its value

Ways to guarantee that a function is executed only once within an object notation

closing custom components in Ag-Grid React columns

Importing a JSON file into a JavaScript script