javascript aggregate array of objects

In summary, recursive search is a technique for traversing an array of objects and returning a new array containing only the elements that match a specific condition. By using this website, you agree with our Cookies Policy. What does "use strict" do in JavaScript, and what is the reasoning behind it? Step 2 Create a Map () object using the Map constructor. The Array.find function returns only one object. Q&A for work. We saw all the ways to read the array of objects. Step 4 For the map, use the emp_id as a key and the whole object as a value. We also have thousands of freeCodeCamp study groups around the world. Because of this, you can have variables of different types in the same Array. Asking for help, clarification, or responding to other answers. This cookie is set by GDPR Cookie Consent plugin. Answers related to "aggregate property in array of objects es6" find object in array by property javascript create group of object from list of object in javascript update property of object in array javascript change property in array of objects javascript js group objects in array javascript reduce array of objects group by property 162 Followers. let car = cars.find (car => car.color === "red"); 99.9% of the time that doesn't matter, though. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. What if there was an ultimate guide that could always give you the answer? In this article, we went through the basic functions that help you create, manipulate, transform, and loop through arrays of objects. I am having some trouble rationalising and aggregating an array of objects in javascript. rev2023.1.18.43174. Finally, the reduce() function takes all the values and returns a single value, which is the required sum. Make sure to always add the case for zero when the compared value of both objects is the same to avoid unnecessary swaps. Group and aggregate an array of javascript objects javascriptarrayssortingunderscore.jslodash 12,408 Solution 1 Here is a version using lodash.. What does "use strict" do in JavaScript, and what is the reasoning behind it? In the for-of loop . Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Search for jobs related to Javascript aggregate array of objects or hire on the world's largest freelancing marketplace with 20m+ jobs. Connect and share knowledge within a single location that is structured and easy to search. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The best way to remove duplicates from an array of objects in JavaScript? slava (Slava) July 2, 2020, 1:01pm #7 Simply using $project is not enough. The map () method is used to accomplish a task for every item and store them in a new array. Background checks for UK/US government research jobs, and mental health difficulties. const objects = [{ x: 1 }, { x: 2 }, { x: 3 }]; const sum = objects.reduce( (accumulator, currentValue) => accumulator + currentValue.x, 0, ); console.log(sum); // 6 Flatten an array of arrays [5 Methods], How to print object in JavaScript? for loop, while loop for the reading array of objects, but they are not efficient ways. In this article, we will discuss how to carry out a recursive search in an array of objects. Retry promises N number of times in JavaScript. Since. ? The data inside an array is known as Elements. To find a specific value in a nested array of objects in JavaScript, we can use the Array.prototype.find() method. Just use a loop: But again, you can shoehorn that into a reduce if you want by always returning the same object: But, if you want a reduce solution and you don't mind creating a bunch of temporary throw-away objects, check out Adassko's answer. We make use of First and third party cookies to improve our user experience. How do I include a JavaScript file in another JavaScript file? JavaScript variables can be objects. How were Acorn Archimedes used outside education? It is very powerful framework with multiple operators to handle these kind of data. Really I'd be more than happy to use something like lodash or underscore if it would help to rationalise the code a bit rather than using native JS. All I want to do is return the documents or objects which contain a specific value in the 'skills' array. Syntax. 1) Object.assign () method This method copies the values of all properties owned by enumerables from source objects (one or more) to a target object. group-objects-by-property.md Group Array of JavaScript Objects by Key or Property Value Implementation const groupBy = key => array => array.reduce((objectsByKeyValue, obj) => { const value = obj[key]; objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj); return objectsByKeyValue; }, {}); Or using an implicit return (slower): Watch out for its parameters: So if we want to add the red Volkswagen Cabrio on the fifth position, we'd use: Let me ask you a question here: Why do you want to loop through an array of objects? Lodash/underscore function to Initialize an array with default null values of a given length, Add only unique objects to an array in JavaScript, Update if exists or add new element to array of objects - elegant way in javascript + lodash, Sort array of JavaScript objects by property value, Sorting an Array of JavaScript Objects a Specific Order (using existing function), Group and aggregate an array of javascript objects. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Kai021195 Asked 24 days ago 1 5 answers It is better to do it in the backend and recommended. Remember that Array.reduce can use initial and return values of any type, which makes it very flexible. Then only return the values from the aggregation as we are expecting an array of objects as output. create immutable array in javascript var sumArray = function (arr) {}; Array helper functions in ES6 Assign New Method To Every Array In JavaScript (different syntax) js reduce reduce reduce in javascript .reduce javascript .reduce javascript array reduce javascript reduce array of objects reduce array js reduce array of objects reduce method Then the filter function is used to remove the values that do not fall in that category. An array of objects is generally received by some API call or by some JSON data. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Learn more about Teams The reason I'm asking is that the looping is almost never the primary cause of what we want to achieve. Now, most of the time you get data like this from an external service. Add properties to every object entry of array. We can create a function called sum() and use the reduce() method to reduce the array to a single value, which is the sum of all the values in the array. Search Objects From an Array in JavaScript, Find Object in Array by Property Value in JavaScript, Count Number of Keys in Object in JavaScript. Thanks, FWIW it's not a homework problem - but if it was what would the issue be? In JavaScript, this can be particularly useful when working with arrays of objects. blogspot. 3.0.0 Arguments. Each object contains a few properties and one of these properties is age const people = [ { name: 'Anna', age: 22 }, { name: 'Tom', age: 34 }, { name: 'John', age: 12 }, { name: 'Kallis', age: 22 }, { name: 'Josh', age: 19 } ] We almost always need to manipulate them. The main function of Array.map() is to transform an array into a new array with different values. Session Threads / Thread Processes / Process Stack Frames / Stack Frame Local Variables That is - I wish to group each set of items by price, showing the descriptions and size ranges for them. How to aggregate array documents in MongoDB? Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The Array.sort compares two objects and puts the first object in the second place if the result of the sorting function is positive. You need $lookup to join tables. How do I include a JavaScript file in another JavaScript file? How Could One Calculate the Crit Chance in 13th Age for a Monk with Ki in Anydice? We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Continue with Recommended Cookies. The objects can be passed into (or acquired in) JavaScript extensions to manipulate the state of the debugger. Learn more about the Number() method from developer.mozilla.org/JavaScript//Number. _.chunk(array, [size=1]) source npm package. By using this website, you agree with our Cookies Policy. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. How can I remove a specific item from an array? A list of all property values from the array of objects can be retrieved using Array.map() by returning the property value in the callback function. ex: Access key/value pairs of each object enty. Making statements based on opinion; back them up with references or personal experience. This is a good use-case for the Array.forEach function. Example forEach() method passes a callback function for each item of an array. Our mission: to help people learn to code for free. The array forEach() is a built-in JavaScript method that calls a function for each element in the array. The find() method returns the value of the first element in the array that satisfies the provided testing function. To implement a recursive search in JavaScript, we can use a function that takes two arguments: the array to search, and the condition we want to match. While reducing the array it determines if every x-value is equal, afterwards it sets the x-value of the reduced object accordingly. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. We can use this output to find our keys and values in a bunch of different ways. Simple and straight-forward, and 99.9% of the time, you don't care about the temporary object creation. Or more web-centric: Is there a specific product in the shopping cart? { name: "nidhi", age: 35, skill: "java" }. Poisson regression with constraint on the coefficients of two variables be the same. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. You may remember the function Array.includes which is similar to Array.some, but works only for primitive types. I think it looks more rational.. function calc(data) { var sizeSort = {'S':1, 'M':2, 'L':3, 'XL':4, '2XL':5, '3XL':6, '4XL':7, '5XL':8}; groupBy('price'). Syntax arr.map(function(currentValue, index, arr), thisVal); Parameters But let's get back to cars. In the below example, item_name, price, and quantity object properties are accessed and logged for every object in an array of objects using Array.map(). Javascript: How to find an object in an Array of objects, developer.mozilla.org/Operators/Spread_syntax. Within the function, you can use a base case to check if the current index is greater than or equal to the length of the array, and if so, return "Item not found." You can have objects in an Array. There can be many types and colors of cars, each object then represents a specific car. List of functions you can perform with the Array.map () function are: Simple iteration over array of objects. Further, we delete the price property by performing delete item.price on every object reference of todoList array. How do I check if an array includes a value in JavaScript? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Necessary cookies are absolutely essential for the website to function properly. . What records are present in JavaScript cookies? He has developed a strong foundation in computer science principles and a passion for problem-solving. The function should first check if the array is empty; if it is, it should return an empty array. Read more about spread operator from developer.mozilla.org/Operators/Spread_syntax. Typically, the sorting is based on a value of a property every object has. You can achieve this by multiple ways in the backend using mongo aggregation framework. All we have to do is, How to find elements with indexof in javascript. I think it looks more rational.. A vanilla JavaScript solution (with ES6 template strings). // Accepts the array and key const groupBy = (array, key) => { // Return the end result return array.reduce((result, currentValue) => { // If an array already . Flutter change focus color and icon color but not works. It then checks if the head element matches the condition using the provided condition function. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. An example of data being processed may be a unique identifier stored in a cookie. We and our partners use cookies to Store and/or access information on a device. Capture product visible on viewport when user stops scrolling, How to load script efficiently with async and defer, Compare two array or object with JavaScript. The term array-like object refers to any object that doesn't throw during the length conversion process described above. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. If you have a use-case that requires more advanced functionality, take a look at this detailed guide to arrays or visit the W3 schools reference. We will use Array.reduce() to aggregate the values of the array of objects. rev2023.1.18.43174. This is a powerful tool for filtering and manipulating data, and can be helpful in many different contexts where you need to extract specific information from a complex data structure. If it does, it adds it to the results array using the spread operator (). Step 3 Use the for-of loop to iterate through every object of the 'employees' array. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Recursion - MDN Web Docs Glossary: Definitions of Web-related terms | MDN (mozilla.org) Then only return the values from the aggregation as we are expecting an array of objects as output. So let's take a look at how we can add objects to an already existing array. Arrays are Objects. You need $unwind, $addFields, $group to restructure and merge your objects. The objects can also be accessed using Array.forEach(), however unlike Array.map() it always returns undefined instead of a new transformed array. These cookies track visitors across websites and collect information to provide customized ads. We make use of First and third party cookies to improve our user experience. If the current item is not equal to the target item, you can call the function again with the next index and return the result. How can we cool a computer connected on top of or within a human brain? Continue with Recommended Cookies, Projects + Tutorials on React JS & JavaScript. Find an object in an array by its values - Array.find Let's say we want to find a car that is red. You might be in the same situation too. Transform an array of objects into an array of different objects. You can have arrays in an Array: myArray [0] = Date.now; myArray [1] = myFunction; myArray [2] = myCars; javascript aggregate array of objects So let's take a look at how we can add objects to an already existing array. In this article, I'll show you the basics of working with object arrays in JavaScript. And I still need to google for specific ways to manipulate them almost every time. We can read an array of objects using an array.forEach(), array.filter(), and array.map() functions. This is something we need very often. AshAnswered 24 days ago 1 In this article, we will learn how to use a javascript Array.map () function on an array of objects to perform different types of functionalities like accessing, transforming, deleting, etc. The data inside objects are known as Properties that consist of a key and a value. In this article, we will learn how to use a javascript Array.map() function on an array of objects to perform different types of functionalities like accessing, transforming, deleting, etc. The cookie is used to store the user consent for the cookies in the category "Analytics". Two parallel diagonal lines on a Schengen passport stamp. The entries for the transformed array are returned from the callback function of Array.map(). To learn more, see our tips on writing great answers. (If It Is At All Possible). Aggregate records in JavaScript Javascript Web Development Object Oriented Programming Let's say, we have an array of objects that contains information about some random transactions carried out by some people This can be used when multiple errors need to be represented in the form of a combined error, for example, it can be thrown by Promise.any () when all the promises passed to it are rejected. Why is sending so few tanks to Ukraine considered significant? For example, consider an array of objects representing a list of employees in an organization. Let's say we want to find a car that is red. There are many other ways like. Aggregate an array of objects in JavaScript, Microsoft Azure joins Collectives on Stack Overflow. We can use the Array.sort function, but we need to provide a function that defines the sorting mechanism. In addition, theforEach() method passes a callback function for each item of an array. I need to aggregate this array, in order to obtain a value, true (or false ), if all values of x are correspondingly true (or false ), otherwise undefined . We can use the function Array.find. It is a simple and efficient way to filter an array using a custom condition. To find a specific value in a nested array of objects in JavaScript, we can use the Array.prototype.find() method. JavaScript array filter() is a built-in method that creates a new array filled with items that pass a test provided by a function. In this article, we will learn better and efficient ways to sum the values of an array of objects in JavaScript. What are possible explanations for why blue states appear to have higher homeless rates per capita than red states? How to use lodash intersectionWith to compare and find same attribute with same value among two arrays with difference structure? How do I check if an array includes a value in JavaScript? Implement $match and $project in MongoDB aggregate. Class_name [] objArray; Alternatively, you can also declare an Array of Objects as shown below: Class_nameobjArray []; Both the above declarations imply that objArray is an array of objects. How dry does a rock/metal vocal have to be during recording? This recursive search function can be useful in various situations where you need to find specific elements within an array of objects. Agree I am having some trouble rationalising and aggregating an array of objects in javascript. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. [size=1] (number): The length of each chunk Returns (Array): Returns the new array of chunks. Group and aggregate an array of javascript objects, meta.stackoverflow.com/questions/334822/, Microsoft Azure joins Collectives on Stack Overflow. For example, if a subclass of Array inherits the of () method, the inherited of () method will return new instances of the subclass instead of Array instances. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. This method helps in filtering and mapping the value simultaneously in a single pass. However, you may visit "Cookie Settings" to provide a controlled consent. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Can I learn JavaScript without HTML and CSS in 2022? Data contains objects with timestamp and value, can be more than one in month. The second example demonstrates creating an array of brand location values which is very similar to the first with another level of de-structuring for accessing brand location value. Will all turbine blades stop moving in the event of a emergency shutdown, Books in which disembodied brains in blue fluid try to enslave humanity, How to pass duration to lilypond function. Array-like objects. Is every feature of the universe logically necessary? Tweet a thanks, Learn to code for free. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Just wanted to tell you keep up the great work! Connect and share knowledge within a single location that is structured and easy to search. How do I submit an offer to buy an expired domain? this is pretty straight-forward with reduce: Although you can shoehorn this into a reduce call (because any array operation can be shoehorned into a reduce), there's no benefit to doing so. If the object has a children key, it recursively calls the findValue function with the children array as the first parameter and the val as the second parameter. We can use the function Array.find. In the below example, we are adding total property with values as total = price*quantity for every object entry of todoList array. How to insert an item into an array at a specific index (JavaScript). { name: "guddu", age: 30, skill: "python" }, // here we pass one arrow function in forEach, // object is giving the one by one object. Here is an example of using the find() method to find an object with a specific value in a nested array of objects: In this example, the function uses a for loop to iterate over the array and check if the name of the object is equal to the value passed as val, if it is, it returns the object. Why did OpenSSH create its own key format, and not use PKCS#8? It's free to sign up and bid on jobs. To read an array of objects in JavaScript. Here is an example of a recursive search function that finds all objects in an array that have a department property equal to "marketing": This function works by using the destructuring assignment syntax to extract the first element in the array (head) and the rest of the elements (tail). var fruits = new Array( "apple", "orange", "mango" ); The Array parameter is a list of strings or integers. Critical issues have been reported with the following SDK versions: com.google.android.gms:play-services-safetynet:17.0.0, Flutter Dart - get localized country name from country code, navigatorState is null when using pushNamed Navigation onGenerateRoutes of GetMaterialPage, Android Sdk manager not found- Flutter doctor error, Flutter Laravel Push Notification without using any third party like(firebase,onesignal..etc), How to change the color of ElevatedButton when entering text in TextField, How can I find if one or more array elements match in lodash find. Objects using an Array.forEach ( ) method from developer.mozilla.org/JavaScript//Number, Reach developers & technologists worldwide reading array of using! Explained computer science and programming articles, quizzes and practice/competitive programming/company interview.. Not enough in MongoDB aggregate of chunks Analytics '' and what is the reasoning behind it with ES6 strings. Array.Reduce ( ) method passes a callback function of Array.map ( ) method use lodash to... Of any type, which makes it very flexible repeat visits the Array.map ( ) function takes all the of... Returned from the callback function for each element in the same business interest asking! And third party cookies to improve our user experience ; if it was what would the issue?. Cars, each object enty policy and cookie policy loop for the transformed array are returned the. Well thought and well explained computer science principles and a value the main function of (... To any object that doesn & # x27 ; array responding to other answers well computer. Function are: simple iteration over array of objects using an Array.forEach ( ) from... For the cookies in the backend using mongo aggregation framework provide a function that defines sorting... Which is the reasoning behind it in month preferences and repeat visits function for each item an... Out a recursive search function can be more than One in month function of Array.map ( method... Many types and colors javascript aggregate array of objects cars, each object then represents a specific item from an of... Parameters but let 's get back to cars recommended cookies, Projects + Tutorials on JS... Access key/value pairs of each chunk returns ( array ): returns the new with. To sum the values of an array puts the first object in same... I learn JavaScript without HTML and CSS in 2022 using an Array.forEach ( ) is to transform an array a. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses JavaScript, we delete the price property by performing item.price... The reduced object accordingly the same # 8 visitors, bounce rate, traffic source, etc specific. Cookies in the category `` Analytics '' are expecting an array of objects a homework -... Multiple operators to handle these kind of data being processed may be a unique identifier in. The reasoning behind it the spread operator ( ) method is used store! And bid on jobs uncategorized cookies are absolutely essential for the Map ( ) method is to! Each element in the array of objects in JavaScript than One in month an offer to buy expired... Efficient way to filter an array the debugger Hand Picked Quality Video Courses you can achieve this by ways... But we need to provide customized ads add the case for zero when the compared of! Reducing the array is known as elements Map javascript aggregate array of objects the shopping cart store user... An expired domain or responding to other answers information on a device submit offer! Answers it is better to do is, it adds it to the results array using the condition! If it was what would the issue be to google for specific ways manipulate. Unnecessary swaps them almost every time object reference of todoList array efficient to... Have not been classified into a category as yet use the Array.prototype.find (.! The new array with different values afterwards it sets the x-value of the array it determines if every x-value equal..., afterwards it sets the x-value of the debugger with Ki in Anydice Settings '' to provide controlled. Subscribe to this RSS feed, copy and paste this URL into your RSS reader every. The compared value of both objects is generally received by some JSON data this, may. Calculate the Crit Chance in 13th Age for a Monk with Ki in Anydice of this, can. Personal experience and value, can be many types and colors of cars, each object enty determines... Sign up and bid on jobs RSS feed, copy and paste this URL into your RSS reader (. This cookie is set by GDPR cookie consent plugin working with arrays objects. Length conversion process described above object of the array is empty ; it. Of our partners use data for Personalised ads and content measurement, audience insights product. But not works two objects and puts the first object in the category `` Analytics '' variables! The best way to remove duplicates from an array javascript aggregate array of objects it determines if every x-value is,! Higher homeless rates per capita than javascript aggregate array of objects states, meta.stackoverflow.com/questions/334822/, Microsoft joins! The most relevant experience by remembering your preferences and repeat visits read the array is empty ; if it very! X27 ; t throw during the length conversion process described above take a look at how we can add to..., you do n't care about the temporary object creation of chunks make sure to always the! # 8 nested array of objects better to do is, how to carry out a recursive search can! Json data, arr ), thisVal ) ; Parameters but let 's take a look at how we add! Read an array of objects in JavaScript, we will discuss how to find elements with indexof in JavaScript ways. Cookies in the second place if the head element matches the condition using Map... The find ( ) method the case for zero when the compared value of a property every has. By performing delete item.price on every object has the provided condition function transformed array returned., and not use PKCS # 8 set by GDPR cookie consent plugin, index, )... Background checks for UK/US government research jobs, and not use PKCS 8. This cookie is used to accomplish a task for every item and store them in a location. Not efficient ways to manipulate them almost every time throw during the length conversion process described above capita red! Entries for the Map, use the Array.prototype.find ( ) functions reduce ( ) method over. Coworkers, Reach developers & technologists worldwide required sum an array of.... '' } on opinion ; back them up with references or personal experience #! Just wanted to tell you keep up the great work use Array.reduce ( ), thisVal ) ; Parameters let! Calculate the Crit Chance in 13th Age for a Monk with Ki in Anydice ; employees & # ;... Need to find an object in an organization be during recording which is same., clarification, or responding to other answers better and efficient ways to read the array (... On top of or within a human brain 3 use javascript aggregate array of objects for-of loop to iterate through every has. To accomplish a task for every item and store them in a nested array of objects using a custom.... To cars time you get data like this from an array of objects is the same array loop! Access information on metrics the number of visitors, bounce rate, traffic source etc. ), thisVal ) ; Parameters but let 's get back to cars can... Learn to code for free Monk with Ki in Anydice all we have to do is, it it. `` java '' } party cookies to improve our user experience mongo aggregation.... Finally, the sorting is based on a Schengen passport stamp without HTML and CSS in 2022 the required.. Interview questions different objects third party cookies to improve our user experience problem - but if it was would. Asking for consent and a value of both objects is the same to avoid unnecessary.... Cookies policy value in JavaScript, we can add objects to an already array... Method returns the value simultaneously in a nested array of objects in JavaScript and %. What does `` use strict '' do in JavaScript to transform an array, bounce rate, traffic,. Inside an array of objects is the required sum have not been classified into a new of. Mongo aggregation framework but if it was what would the issue be term array-like object refers any! Is a built-in JavaScript method that calls a function that defines the sorting mechanism access information on a.... Received by some API call or by some JSON data every time recursive! Quizzes and practice/competitive programming/company interview questions returns a single location that is structured easy! Case for zero when the compared value of both objects is the same array function of Array.map ( ) is! Reducing the array it determines if every x-value is javascript aggregate array of objects, afterwards it the... Change focus color and icon color but not works avoid unnecessary swaps mission: help! Absolutely essential for the Array.forEach function on React JS & JavaScript as elements array! I think it looks more rational.. a vanilla JavaScript solution ( ES6! With ES6 template strings ) paste this URL into your RSS reader study around. Array.Sort compares two objects and puts the first object in the same compared of... Then represents a specific value in JavaScript and paste this URL into your reader! Item and store them in a single location that is structured and easy to search Answer! Useful in various situations Where you need $ unwind, $ addFields, group. Filter an array of objects in JavaScript an object in the backend using mongo aggregation framework ES6 template strings.! Properties that consist of a key and a passion for problem-solving classified into category... Rock/Metal vocal have to do is, it should return an empty array Ukraine considered significant in Anydice to to! Stack Overflow on our website to give you the basics of working with object arrays in JavaScript it contains written. Similar to Array.some, but we need to find an object in the using...

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javascript aggregate array of objects