Embed the variable directly within the JSON structure

Question

Embed the variable directly within the JSON structure

My goal is to dynamically create a JavaScript object using object initializer notation, but with keys taken from a config object. Instead of the traditional method:

var obj = {
  'key' : 'some value'
};

I envision something like this:

var config = {
  myKeyName: 'key'
};

var obj = {
  config.myKeyName : 'some value' // this is just an illustration
};

The challenge lies in how to incorporate the value of config.myKeyName in this particular scenario.

Is there a way to achieve this?

Update: I am familiar with using indexing ([]), but that may not be feasible for deeply nested objects.

javascript json

Answer 1

Answer №1

Based on the feedback and revisions you've made, it appears that your main inquiry is about the possibility of utilizing dynamic keys within deeply nested objects while still adhering to the object initializer syntax.

For instance, rather than the traditional approach:

var key1 = "x", key2 = "y", key3 = "z", object;
object = {}
object[key1] = {};
object[key1][key2] = {};
object[key1][key2][key3] = 42;

You are exploring a scenario like this:

var object = {
    /*using key1 dynamically to retrieve "x"*/: {
        /*using key2 dynamically to retrieve "y"*/: {
            /*using key3 dynamically to retrieve "z"*/: 42
        }
    }
};

Regrettably, the answer remains negative; there is no approach to achieve this without resorting to eval. The keys must be fixed within an object initializer and cannot be ascertained from variables. The notation of [] remains the optimal method for specifying a property name with a string. Another bulkier option is Object.defineProperty, but it's limited to ES5. Given your intricate nested structures, a recursive factory function seems to be the most suitable solution.

Answer 2

Based on the feedback and revisions you've made, it appears that your main inquiry is about the possibility of utilizing dynamic keys within deeply nested objects while still adhering to the object initializer syntax.

For instance, rather than the traditional approach:

var key1 = "x", key2 = "y", key3 = "z", object;
object = {}
object[key1] = {};
object[key1][key2] = {};
object[key1][key2][key3] = 42;

You are exploring a scenario like this:

var object = {
    /*using key1 dynamically to retrieve "x"*/: {
        /*using key2 dynamically to retrieve "y"*/: {
            /*using key3 dynamically to retrieve "z"*/: 42
        }
    }
};

Regrettably, the answer remains negative; there is no approach to achieve this without resorting to eval. The keys must be fixed within an object initializer and cannot be ascertained from variables. The notation of [] remains the optimal method for specifying a property name with a string. Another bulkier option is Object.defineProperty, but it's limited to ES5. Given your intricate nested structures, a recursive factory function seems to be the most suitable solution.

Answer 3

Answer №2

One way to dynamically access a property is by using the square bracket syntax. For instance, if config.keyName contains the value "hello":

var obj = {};
obj[config.keyName] = "some value";

/* This is the same as:

   var obj = {
       hello: "some value"
   };
*/

Additionally, it is important to clarify that this code is creating a JavaScript object literal, not JSON. JSON is a textual data format commonly used for data exchange, although it does share some similarities with JavaScript object literals.

Answer 4

One way to dynamically access a property is by using the square bracket syntax. For instance, if config.keyName contains the value "hello":

var obj = {};
obj[config.keyName] = "some value";

/* This is the same as:

   var obj = {
       hello: "some value"
   };
*/

Additionally, it is important to clarify that this code is creating a JavaScript object literal, not JSON. JSON is a textual data format commonly used for data exchange, although it does share some similarities with JavaScript object literals.

Answer 5

Answer №3

In the world of JavaScript, there is no such concept as "JSON notation." Instead, it is referred to as object literal notation. JSON actually utilizes a portion of the JavaScript notation, not the other way around.

When working with object literals, it is important to note that you cannot use variables directly for property names. Instead, you must utilize property indexing to add properties to the object:

var obj = {};
obj[settings.myKeyName] = "some content";

Answer 6

In the world of JavaScript, there is no such concept as "JSON notation." Instead, it is referred to as object literal notation. JSON actually utilizes a portion of the JavaScript notation, not the other way around.

When working with object literals, it is important to note that you cannot use variables directly for property names. Instead, you must utilize property indexing to add properties to the object:

var obj = {};
obj[settings.myKeyName] = "some content";

Answer 7

Answer №4

const myObj = {}

myObj[settings.theKeyName] = 'a certain string';

Answer 8

const myObj = {}

myObj[settings.theKeyName] = 'a certain string';

Answer 9

Answer №5

let configuration = {
  keyLabel: 'key'
};

let object = {
  'configuration.keyLabel' : 'some data' // pay attention to the quotation marks on the key
};
//console.log(object);

Answer 10

let configuration = {
  keyLabel: 'key'
};

let object = {
  'configuration.keyLabel' : 'some data' // pay attention to the quotation marks on the key
};
//console.log(object);

Embed the variable directly within the JSON structure

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Similar questions

Guide on importing npm packages without TypeScript definitions while still enabling IDE to provide intelligent code completion features

Issue with SVG on tainted canvas causes IE security error when using toDataURL

Communicate with a PHP page using Volley for both sending and receiving data

Utilizing the Linux grep command to extract key values from a JSON file

Can an HTML DOM object be converted to a JSON string using JSON.stringify in JavaScript?

Express server consistently receives JSON requests that contain no data in the request body

What could be causing the issue with dayjs dynamic importing in TypeScript?

Having trouble getting a div to slide to the left on hover and collapse on mouseout using Jquery?

Discovering insights from JSON files in Data Lake Gen 2 using Azure Data Factory

Monitor and adjust variables simultaneously using AngularJS

Refreshing the page causes JavaScript to fail loading

Utilize Node.js to simultaneously connect with several APIs

Checking the validity of the primary key information in the destination table using JSON source data and replacing it with updated values

Stop automatic form submissions from the enter key

I am in need of a datepicker for my project that will display the END date as the current date and set the START date as 7 days before the END date

Measuring Internet speed using Node.js

ReactJs allows for fluid scroll animations that persist as long as the mouse is clicked or a button

Interactive hover text appears when you mouse over the SVG path

Using a self-invoking function in JavaScript with addEventListener

What is the best way to animate changes to a background image using jQuery?