Javascript object get all fields

Get all fields from object javascript code example

Solution: Just iterate normally and check whether the property name contains : Of course this works only under the assumption that is not contained in other property names. Class can be a problematic term, because it can refer to CSS/DOM classes or Javascript classes, which are totally unrelated.

Get all fields of object

Here’s some code to get you started

#lang racket > (define x% (class object% (inspect #f) (init-field x y) (super-new))) > (define obj (make-object x% 1 2)) > (let-values (((name field-cnt field-name-list field-accessor field-mutator super-class skipped) (class-info x%))) (for/hash ((name field-name-list) (idx field-cnt)) (values name (field-accessor obj idx)))) '#hash((x . -1) (y . 0)) 

You may want to change the inspector from #f to something less vulnerable, but open enough for your needs. Read up on class-info and inspectors in general.

How to retrieve all fields from a json file?, You need to pass the correct json path. var borFld = Object.keys (json.features [0].properties); If you have multiple objects in the array then you need to run a for loop on array and pass the above line …

How to get all fields in class

I assume you mean when you speak about a class ? This is an element , not a class.

Class can be a problematic term, because it can refer to CSS/DOM classes or Javascript classes, which are totally unrelated.

So if you have then something is a CSS/DOM class, but the entire thing is not that class but an element having that class.

Now also what you refer to by fields are also just element s.

So what you want is to select all elements that have the class form-row-extra-phone and of them all descendant elements with an name attribute. And thats pretty easy. Basically in a CSS selector the (space) is the selector for descendant elements.

So you can select .form-row-extra-phone [name] .

So what you probably want is something like this:

document.querySelectorAll('.form-row-extra-phone [name]') .forEach(elem => elem.name.replace(/8/, x => Number(x) + 1)); 

When you use ^= it means starts with, and $= means ends with.

If condition is (name AND id)

 $('.form-row-extra-phone input[name^="extraPhone"][id^="id_extraPhone"]') 

If condition is (name OR id)

 $('.form-row-extra-phone input[name^="extraPhone"],input[id^="id_extraPhone"]') 

How to get all objects of a given type in javascript, I want to retrieve all objects (not DOM elements) how to get all objects of a given type in javascript. Ask Question Asked 12 years, 3 months ago. Modified 12 years, 3 months ago. Viewed 15k times Small datasheet code running super slow on Excel VBA

Javascript — Get object fields using a given array of keys

function denormalizeUserData(userData, . fields) < const denormalized = <>; for (const field of fields) < if (userData[field] !== undefined) denormalized[field] = userData[field]; >return denormalized; > 

Edit: in case someone says a code-only answer is blah blah blah

This is simple enough to be a simple code block.

You can get the object property/value pairs with Object.entries , then use Array.filter to filter out the pairs whose property name is not included in fields and whose value is undefined , then use Object.fromEntries to convert it back to an object.

const userData = < avatar: undefined, name: "Raul", username: "raulito", celebrity: true >function denormalizeUserData(userData, . fields) < return Object.fromEntries(Object.entries(userData).filter(e =>fields.includes(e[0]) && e[1] != undefined)) > console.log(denormalizeUserData(userData, "avatar", "name"))

Grab the Object.entries and build a new object if there is a value, and if the args array includes the key.

const userData = < avatar: undefined, name: "Raul", username: "raulito", celebrity: true >; function denormalizeUserData(obj, . args) < const out = <>; for (let Javascript object get all fields of Object.entries(obj)) < if (value && args.includes(key)) < outJavascript object get all fields = value; >; > return out; > console.log(denormalizeUserData(userData)); console.log(denormalizeUserData(userData, 'avatar', 'name')); console.log(denormalizeUserData(userData, 'avatar', 'name', 'celebrity'));

Get all fields from class c# Code Example, F# tuple get item. c# get list of all class fields. c# get object property value by name. c# get property type of list. c# get all inherited classes of a class. c# get class name by type. c# Get all class by namespace. attribute c# get method name reflection. c# get all classes derived from type.

Get JavaScript object’s fields by string name pattern

Just iterate normally and check whether the property name contains ‘Filter’ :

var B = <>, i, prefix; for(var prop in A) < if(A.hasOwnProperty(prop)) < i = prop.indexOf('Filter'); if(i >-1) < prefix = prop.substr(0, i); B[prefix] = < value: A[prefix], filter: A[prop], type: A[prefix+'Type'] >; > > > 

Of course this works only under the assumption that ‘Filter’ is not contained in other property names.

Reference : String.prototype.indexOf , String.prototype.substr

How to get all the methods of an object using JavaScript, Approach 1: Create a function which takes object as input. Use typeof operator, which checks if the type of object is function or not. If the type of object is function then it returns the object. Example: This example implements the above approach. Ways to print all methods of an object.

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How to List the Properties of a JavaScript Object

In this tutorial, two mostly used methods are presented, which will list the properties of a JavaScript object.

You can use the built-in Object.keys method which is supported in the modern browsers:

let keys = Object.keys(myObj);

Example:

Javascript Object.keys method

To retrieve the list of the property names, you can do the following:

let getKeys = function (obj) < let keysArr = []; for (var key in obj) < keysArr.push(key); >return keysArr; >

Example:

Javascript object list of the property names

Alternatively, you can replace var getKeys with Object.prototype.keys to allow you to call .keys() on any object. However, extending the prototype has some side effects and is not recommended.

You can also use the for. in construct to iterate over an object for its attribute names. However, doing it, you will iterate over all attribute names in the object’s prototype chain. To iterate only over the attributes of the object, you can use the hasOwnProperty() method like this:

for (var key in obj) < if (obj.hasOwnProperty(key)) < /* code here */ > >

Example:

Javascript object hasOwnProperty() method

The Object.keys() method

The Object.keys() method returns the array of a specified object’s own enumerable property names. The property order is the same as in the case of looping over the properties of the object manually.

The hasOwnProperty() Method

The hasOwnProperty() method returns a boolean value that indicates if the object has the specified property as its own property or not. If the object contains the «key» property, a function is created. This would return true if it could find no keys in the loop, meaning the object is empty. If any key is found, the loop breaks returning false.

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How to get all own properties of an object in JavaScript

To get all own properties of an object in JavaScript, you can use the Object.getOwnPropertyNames() method.

This method returns an array containing all the names of the enumerable and non-enumerable own properties found directly on the object passed in as an argument.

The Object.getOwnPropertyNames() method does not look for the inherited properties.

const user =  name: 'Alex', age: 30 > const props = Object.getOwnPropertyNames(user) console.log(props) // [ 'name', 'age' ] 

If you are interested in the own enumerable properties of the object, use the Object.keys() method instead:

const user =  name: 'Alex', age: 30 > const props = Object.keys(user) console.log(props) // [ 'name', 'age' ] 

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How to Get All Property Values of a JavaScript Object

To detect all the property values of object without knowing the key can be done in a number of ways depending on browsers. The majority of browsers support ECMAScript 5 (ES5). Let’s see what methods can be used for getting the property value based on different specifications.

ECMAScript 5+

You can use the methods below in the browsers supporting ECMAScript 5+. These methods detect values from an object and avoid enumerating over the prototype chain:

Javascript detect values from an object

To make the code more compact, use the forEach:

Javascript detect values from an object use forEach

The following method builds an array which contains object values:

Javascript detect values from an object builds an array

To make those using Object.keys safe against null, then you can run:

Javascript detect values from an object builds an array

Object.keys returns enumerable properties. Using Object.keys is usually effective for iterating over simple objects. If you have something with non-enumerable properties to work with, you can use:

Object.getOwnPropertyNames instead of Object.keys.

ECMAScript 2015+ ( ES6)

It is easier to iterate Arrays with ECMAScript 2015. You can use the following script when working with values one-by-one in a loop:

Javascript detect values one-by-one from an object

To use ECMAScript 2015 fat-arrow functions and to map the object to an Array of values can become a one-liner code:

Javascript detect values from an object

The ECMAScript 2015 specification introduces Symbol, instances of which can be used as property names. You can use the Object.getOwnPropertySymbols to get the symbols of an object to enumerate over. The new Reflect API from ECMAScript 2015 provides Reflect.ownKeys returning a list of property names and symbols.

Object.values

This just adds a method to object. Using fat-arrow functions can be a one-liner:

Javascript detect values from an object using Object.values

Object.values = obj => Object.keys(obj).map(key => objJavascript object get all fields); //which you can now use like // [‘one’, ‘two’, ‘three’] let values = Object.values(< a: 'one', b: 'two', c: 'three' >); console.log(values);

If you do not want to use shimming when a native Object.values exists, then you can run:

Javascript detect values from an object using Object.values

Object.values = Object.values || (obj => Object.keys(obj).map(key => objJavascript object get all fields)); let values = Object.values(< a: 'one', b: 'two', c: 'three' >); console.log(values);

ECMAScript 2017+

This specification adds Object.values and Object.entries where both return arrays. Object.values can be used with a for-of loop:

Javascript detect values from an object used Object.values

If you want to use both the key and the value, then you can use the Object.entries:

Javascript detect values from an object used Object.entries

Object.keys/values/entries methods have similarity with for..in loop. They all ignore properties that apply Symbol(. ) as a key. When you need symbols, you can use a separate method Object.getOwnPropertySymbols which returns an array consisting of only symbolic keys.

Related Resources

• How to Count the Number if Keys/Properties of a JavaScript object
• How to Check for the Existence of Nested JavaScript Object Key
• How to Check if an Object has a Specific Property in JavaScript
• How to Loop Through or Enumerate a JavaScript Object
• How to Get the First Key Name of a JavaScript Object
• How to Check if a Value is an Object in JavaScript
• How to Check if a Key Exists in JavaScript Object
• How to List the Properties of a JavaScript Object
• How to Convert Arguments Object to an Array
• How to Check if JavaScript Object is Empty
• How to Sort JavaScript Object by Key
• JavaScript Object.keys, Values, Entries
• JavaScript Proxy and Reflect
• JavaScript Loops: while and for
• Javascript Objects
• JavaScript Array methods
• JavaScript Symbol Types
• JavaScript Arrays

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