Convert object to array js

Here is a need to convert an array into an object. To do so we are going to use a few of the most preferred methods. First here is a method to know.

Example This example converts the array to object by using Object. For display it, JSON. Example This example converts the array to object by creating a function which adds the array values one by one to the object. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Writing code in comment? Please use ide. How to pass an array as a function parameter in JavaScript? How to move mouse pointer to a specific position using JavaScript? How to iterate over a JavaScript object? How to remove spaces from a string using JavaScript? How to clone array in ES6? How to get client IP address using JavaScript? Syntax: Object. Convert Array to Object. How to convert arguments object into an array in JavaScript?

How to convert an object to string using JavaScript?This tutorial is going to be sole satisfying, no matter which programming language you work upon. Ordinarily, a software developer has to play around with JSON Data on the daily basis to manage the information for the users. So let us try to find out roughly what JSON is and why we started talking about it at the very beginning of this tutorial.

Indeed JSON is a big deal when we talk about dealing with data in the modern web, and mobile app development. JSON is certainly the lightweight format for storing and exchanging the information data between client and server.

As we know, JSON is usually helping us exchanging the data from the client-side to a remote server. So, when we have the JavaScript data in the Object form, it has to be in the string form to be sent to the webserver. Once the JavaScript object or array is converted into the string, then you have got the data in the form of JSON string, and we are ready to send this data to the server.

Let us find out what experiment we did above, we created a JavaScript array and poured some values in it indeed some fruit names. Then we took out the JSON. So, we have got the data some fruit names along with true a boolean value in the console. This means our fruit names data is successfully converted into a string and waiting to be sent to the server.

Data can be sent to the server using HTTP request or Ajax request, and if you are a beginner, then i would suggest you must check out the following tutorial we recently created on:. Send data to the server using the HTTP request. Send data to the server using the Axios library.

Just the way we converted an array to a string, the same we will transform JavaScript object into string in the given below example. In the above example, we declared var obj and assigned some values to the object, and it included only some user data.

The data structure is such which can is very much understandable even for a newbie. So far, we have looked into the various aspects of converting arrays and objects into JSON string. Now we are going to have a look at how to convert date objects into JSON string. We can even go one step further and use the toJSON method to convert a date object to a string.

So what makes this toJSON is the excellent function? Well, it is supported by all the major browsers firefox, chrome, safari, and opera. Now we are going to end up our tutorial, which was on converting Javascript data types such as arrays, objects to JSON string. The JSON. Exactly that is where JSON.The Array. The source for this interactive example is stored in a GitHub repository. A new Array instance.

More clearly, Array. In ES, the class syntax allows sub-classing of both built-in and user-defined classes. As a result, static methods such as Array. As such, it may not be present in other implementations of the standard. You can work around this by inserting the following code at the beginning of your scripts, allowing use of Array. In addition, since true iterables cannot be polyfilled, this implementation does not support generic iterables as defined in the 6 th Edition of ECMA Get the latest and greatest from MDN delivered straight to your inbox.

Sign in to enjoy the benefits of an MDN account. This is especially important for certain array subclasses, like typed arrayssince the intermediate array would necessarily have values truncated to fit into the appropriate type.

The compatibility table in this page is generated from structured data. Last modified: Mar 4,by MDN contributors. Related Topics. Standard built-in objects Array Properties Array. Learn the best of web development Get the latest and greatest from MDN delivered straight to your inbox. The newsletter is offered in English only at the moment. Sign up now. Sign in with Github Sign in with Google. Chrome Full support Edge Full support Firefox Full support IE No support No.

Opera Full support Safari Full support 9. WebView Android Full support Chrome Android Full support Firefox Android Full support Opera Android Full support Safari iOS Full support 9. Samsung Internet Android Full support 5.A line you may have encountered every now and then inside some JavaScript functions looks like this:.

And just when you think you've finally gotten a handle on the language, cryptic lines like the above shake your confidence, as JavaScript often will do. In this short tutorial, lets elaborate on the subject line and delve into just what Array. In JavaScript, there are arrays, then there are array-like objects. The later is any object with a " length " property that returns the number of elements inside the object, plus numeric indices giving access to elements inside it.

Examples of this include the arguments array of a function, HTMLCollection collectionsand custom objects with a length property and numeric indices. The following are all array-like objects in JavaScript:.

While such objects may appear to be arrays in that individual elements within it can be accessed numerically, for example. The difference between an array and an object masquerading as one lies in the extensive list of useful methods the former has at its disposal, which at times surely can come in handy when working with the later as well.

And that's where the cryptic Array. Most of us are already familiar with Array's slice start, [end] method to return a "slice" of an array:. The slice method in this case belongs to the Array object its " this " object points to our array instance. By calling the slice method as a method of the desired array-like object instead, that process coerces the later into a true array at the same time.

And thankfully JavaScript makes it easy to do just that, invoke a method as if it belongs to a different host function, via the call and apply methods. When we invoke a method this way, the resulting " this " object points not to the original function associated with it, but the new function.

Armed with this knowledge, we are half way to understanding why the following works in converting an array-like object into a true array:. And since the slice method supports optional "start" and "end" parameters to return just a portion of an array as a new array, we can do the following:. The one remaining question is why we're calling slice on the prototype object of Array instead of an array instance.

convert object to array js

The reason is because this is the most direct route to accessing the slice method of Array when that's all we're interested in; we could have first created an array instance, but that's less efficient and arguably more abstruse:. Now that we've demystified Array.

Converting array-like objects into arrays using Array. Copyright c JavaScript Kit. Converting objects to arrays using Array. Arrays versus array-like objects In JavaScript, there are arrays, then there are array-like objects. Using Array. Most of us are already familiar with Array's slice start, [end] method to return a "slice" of an array: ["zero", "one", "two", "three"].You can use the typeof operator to find the data type of a JavaScript variable. You cannot use typeof to determine if a JavaScript object is an array or a date.

The typeof operator is not a variable. It is an operator. But, the typeof operator always returns a string containing the type of the operand.

convert object to array js

The constructor property returns the constructor function for all JavaScript variables. You can check the constructor property to find out if an object is an Array contains the word "Array" :. You can check the constructor property to find out if an object is a Date contains the word "Date" :. In the chapter Number Methodsyou will find more methods that can be used to convert numbers to strings:.

In the chapter Date Methodsyou will find more methods that can be used to convert dates to strings:. In the chapter Number Methodsyou will find more methods that can be used to convert strings to numbers:. If the variable cannot be converted, it will still become a number, but with the value NaN Not a Number :.

The global method Number can also convert booleans to numbers. The global method Number can be used to convert dates to numbers. When JavaScript tries to operate on a "wrong" data type, it will try to convert the value to a "right" type. JavaScript automatically calls the variable's toString function when you try to "output" an object or a variable:.

This table shows the result of converting different JavaScript values to Number, String, and Boolean:. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. Example "John". Example x. Europe Daylight Time ". Example Date.

How to Convert a JS Object to an Array Using jQuery

Number "3. HOW TO. Your message has been sent to W3Schools. W3Schools is optimized for learning, testing, and training. Examples might be simplified to improve reading and basic understanding. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.

While using this site, you agree to have read and accepted our terms of usecookie and privacy policy. Copyright by Refsnes Data. All Rights Reserved.Objects are more complex and each object may contain any combination of these primitive data-types as well as reference data-types, while the array is a single variable that is used to store different elements. It is often used when we want to store list of elements and access them by a single variable.

Approach: By using Object. Parameter: obj: It is the object whose enumerable properties are to be returned. Method 2: In this method, we will use Object. Approach: We will use Object. The ordering of the properties is the same as that given by looping over the property values of the object manually. Parameter: obj: It is the object whose enumerable own property [key, value] pairs are to be returned.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Writing code in comment? Please use ide. How to move mouse pointer to a specific position using JavaScript? How to iterate over a JavaScript object? How to remove spaces from a string using JavaScript? How to clone array in ES6? How to get client IP address using JavaScript? How to convert an object to string using JavaScript? How to add an object to an array in JavaScript? How to push an array into the object in JavaScript? How to check object is an array in JavaScript? How to convert Integer array to String array using JavaScript?

How to convert Set to Array in JavaScript? How to check if an array includes an object in JavaScript? Check out this Author's contributed articles.

convert object to array js

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Array.from()

With ES7 you will be able to use Object. EDIT - if you want you could also keep the indexes of your object, but you have to check if they are numeric and you get undefined values for missing indexes:. Since ES5 Object. It's supported by every modern browser forget IE.

The official documentation. Fiddle Demo. You can create a simple function to do the conversion from object to arraysomething like this can do the job for you using pure javascript:.

Also in the future we will have something called Object. Learn more. Asked 8 years, 8 months ago. Active 1 year, 5 months ago. Viewed k times. Anthony Johnston 8, 4 4 gold badges 36 36 silver badges 53 53 bronze badges. The Bndr The Bndr Should the array indices be the same as keys in original object? First index in an array is always 0, but your own code and most answers including the accepted one seem to ignore it; still, you've reverted my edit to desired example result.

Yes, you are right: first Array element starts with 0. Active Oldest Votes. Nathan J. Dogbert Dogbert k 31 31 gold badges silver badges bronze badges.

Every search I try to do on this just turns up lots of links to jQuery or the map method of arrays.


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