employ a specific value in place of an index within an array object

Question

employ a specific value in place of an index within an array object

I'm having trouble formatting my array for localStorage storage. Is it possible to change the index value of an array? Here's what my array object looks like:

const myArray = [{id: 41, name: "x"}, {id: 42, name: "y"}]

But I would like it to be structured like this:

const myArray = [ 41: {id:41, name:"x" }, 42: {id:41, name:"y" }}

This way, the id of the object becomes the index of the array

If that's not achievable, then this alternative format would also work:

const myArray = [ {41: {id:41, name:"x"} }, {42: {id:41, name:"y"}}]

In essence, I want the id of the object to serve as either the index or a container object for that particular object.

javascript arrays json object local-storage

Answer 1

Answer №1

Modifying the key of an element directly within an array to a specific value is not possible, similar to changing an object's property. However, you can achieve this by creating an object where the keys represent the IDs and the corresponding values are the objects.

const myArray = [{id: 41, name: "x"}, {id: 42, name: "y"}];
const myObject = {};

// Transforming the array into an object
myArray.forEach(item => {
    myObject[item.id] = item;
});

// The structure of myObject will now be:
// { 41: {id:41, name:"x"}, 42: {id:42, name:"y"} }

// If you require it as an array with IDs as keys:
const newArray = Object.keys(myObject).map(key => ({ [key]: myObject[key] }));

// The resulting newArray will be:
// [ {41: {id:41, name:"x"} }, {42: {id:42, name:"y"}} ]

Answer 2

Modifying the key of an element directly within an array to a specific value is not possible, similar to changing an object's property. However, you can achieve this by creating an object where the keys represent the IDs and the corresponding values are the objects.

const myArray = [{id: 41, name: "x"}, {id: 42, name: "y"}];
const myObject = {};

// Transforming the array into an object
myArray.forEach(item => {
    myObject[item.id] = item;
});

// The structure of myObject will now be:
// { 41: {id:41, name:"x"}, 42: {id:42, name:"y"} }

// If you require it as an array with IDs as keys:
const newArray = Object.keys(myObject).map(key => ({ [key]: myObject[key] }));

// The resulting newArray will be:
// [ {41: {id:41, name:"x"} }, {42: {id:42, name:"y"}} ]

employ a specific value in place of an index within an array object

Answer №1

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