How can I convert an array of objects into an array of objects with the same values but with modified keys?

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I have an array with objects and want to convert this to an array containing the same values but with different key names. (JavaScript)

For example, an array of

[{name: "Bob", age: 50, person: true}, {name: "Jerry", age: 20, person: true}]

becomes

[{identification: "Bob", years: 50, person: true}, {identification: "Jerry", years: 20, person: true}]

Using the Map function works perfectly here.

const people = [
    {name: "Bob", age: 50, person: true},
    {name: "Jerry", age: 20, person: true}
];

const formatted = people.map((person) => ({
    identification: person.name,
    years: person.age,
    person: person.person
});

This should work for this problem.

Data Structures: Objects and Arrays :: Eloquent JavaScript, Objects allow us to group values—including other objects—to build more You'd have to somehow extract the digits and convert them back to numbers to Both value.x and value[x] access a property on value —but not necessarily the same property. To find out what properties an object has, you can use the Object.​keys  We can convert an Object {} to an Array [] of key-value pairs using methods discussed below: Method 1: In this method, we will use Object.keys() and map() to achieve this. Approach: By using Object.keys(), we are extracting keys from the Object then this key passed to map() function which maps the key and corresponding value as an array, as


I think that you may use the map method this method returns and array with the same length as the one you are mapping:

 const array = [{name: "Bob", age: 50, person: true}, {name: "Jerry", age: 20, person: true}];

let newKeysArray = array.map( a => { 
   let obj = { 
        identification: person.name,
        years: person.age,
        person: person.person
   };
   return obj
 } );

So inside the map you are assigning the values that you need to a new object and return the object as the mapped item.

Array methods, The arrays are objects, so we can try to use delete : That's natural, because delete obj.key removes a value by the key . findIndex method is essentially the same, but it returns the index where the element It also returns the sorted array, but the returned value is usually ignored, as arr itself is modified. ES7: Using Object.values() to convert an object to array in JavaScript. In ES6 rollout, we can only fetch property names but not their values. But, we may want to retrieve ts values as well. Hence, ES7 introduced an option to fetch the values as illustrated in the below example. The output obtained is thus in the form of an array.


Just in case you prefer to modify the objects in place, you can make use of a strategy by nverba here:

let rows = [
    {name: "Bob", age: 50, person: true}, 
    {name: "Jerry", age: 20, person: true}
];

let keyMaps = [
    ['name', 'identification'],
    ['age', 'years'],
];

for(let keyMap of keyMaps)
for(let row of rows)
    delete Object.assign(row, {[keyMap[1]]: row[keyMap[0]] })[keyMap[0]];

console.log(rows);

Destructuring assignment, But when we pass those to a function, it may need not an object/array as a whole, but rather But the array itself is not modified. We can use it with destructuring to loop over keys-and-values of an object: The pattern at the left side of the assignment has the same structure to extract values from them:. Convert Object to Array Example. This section will see how we can convert Object to Array in Angular and Typescript with examples. Typescript Code. Let us assume that you have an object declared multiple properties. First Get the named keys using object.keys() method. This method retrieves keys from the given object and returns an array of keys.


Useful Javascript Array and Object Methods, With all these array and object methods you'll find you never have to reach for a for or Creates a new array by manipulating the values in another array. objects by a property, and removing duplicate items in array. Similar to .some() , but checks if all items in an array pass a condition. Object.keys(). Object to array javascript. Convert an Object to an Array in JavaScript, The Object.values() method returns an array of a given object's own enumerable property values, in the same order as that provided by a forin Object.values(), [[1,5],[2,7],[3,0],[4,0]]. How can I convert an Object to an Array of key-value pairs in JavaScript? share.


How To Create, Modify, and Loop through Objects in JavaScript , JavaScript arrays are also a type of object. you are using, but you should notice that all of the values passed to the object are shown in the output. Using the same method, an object's property can be modified by assigning a new We have used a string method to convert the key values to upper case. You can convert an array into an object using one of these three methods: The Object.assign () function. Loop over the array and construct a new object. The reduce () function. We'll go over each of those methods in this article and provide some code examples for you to use on your website or application.


Quick Tip: How to Sort an Array of Objects in JavaScript, If you have an array of objects that you need to sort into a certain order, you But before you do, remember that you can do some pretty neat To avoid this, you can create a new instance of the array to be sorted and modify that instead. To reverse the sorting order, you can invert the return value of the  What we do in the snippet above is use reduce, which returns accumulator (obj), to which we append each item in the array using that items id. This will convert our array of objects into an object