How do I test for an empty JavaScript object

Question

After an AJAX request  sometimes my application may return an empty object  like   var a         How can I check whether that s the case

User · Answer

function isEmpty obj      for var i in obj    return false      return true

User · Answer

Try Destructuring  const a       const   b     a  const emptryOrNot    b     not Empty     empty   console log emptryOrNot

User · Answer

This one line code helps with fallback to older browsers too   var a         if empty returns false  Object getOwnPropertyNames   Object getOwnPropertyNames a  length     0    function    for var key in a  break  return   key         Returns False  var a    b 2     if not empty returns true  Object getOwnPropertyNames   Object getOwnPropertyNames a  length     0    function    for var key in a  break  return   key         Returns true     Object getOwnPropertyNames is implemented in ECMA-5  the above line works in older browsers with a fallback function        Another quick solution is checking the length property of   Object keys  Object entries or Object values   Knowledge article  Follow this SO post for detailed difference between Object keys Vs Object getOwnPropertyNames

User · Answer

The correct answer is   const isEmptyObject   obj   gt    Object getOwnPropertyNames obj  length     0  amp  amp    Object getOwnPropertySymbols obj  length     0  amp  amp    Object getPrototypeOf obj      Object prototype    This checks that    The object has no own properties  regardless of enumerability   The object has no own property symbols  The object s prototype is exactly Object prototype    In other words  the object is indistinguishable from one created with

User · Answer

This is my preferred solution   var obj       return Object keys obj  length    returns 0 if empty or an integer  gt  0 if non-empty

User · Answer

I am using this   function isObjectEmpty object      var isEmpty   true    for  keys in object         isEmpty   false       break     exiting since we found that the object is not empty       return isEmpty      Eg   var myObject          Object is empty var isEmpty    isObjectEmpty myObject      will return true      populating the object myObject     name   John Smith   Address   Kochi  Kerala         check if the object is empty isEmpty    isObjectEmpty myObject      will return false    from here  Update  OR  you can use the jQuery implementation of isEmptyObject  function isEmptyObject obj      var name    for  name in obj        return false        return true

User · Answer

The following example show how to test if a JavaScript object is empty  if by empty we means has no own properties to it   The script works on ES6    x000D   x000D  const isEmpty    obj    gt    x000D      if  obj     null    x000D          obj     undefined    x000D          Array isArray obj     x000D          typeof obj      object  x000D          x000D          return true  x000D        x000D      return Object getOwnPropertyNames obj  length     0  x000D     x000D  console clear    x000D  console log  -----    x000D  console log isEmpty                    true x000D  console log isEmpty 33                 true x000D  console log isEmpty                    true x000D  console log isEmpty                    true x000D  console log isEmpty   length  0  custom property             false x000D  console log  -----    x000D  console log isEmpty  Hello             true x000D  console log isEmpty  1  2  3           true x000D  console log isEmpty   test  1          false x000D  console log isEmpty   length  3  custom property   1  2  3          false x000D  console log  -----    x000D  console log isEmpty new Date           true x000D  console log isEmpty Infinity           true x000D  console log isEmpty null               true x000D  console log isEmpty undefined          true x000D   x000D   x000D

User · Answer

let jsObject   JSON parse JSON stringify obj    key  value    gt                    if  value     null                        value                                value constructor     Object  amp  amp  Object entries value  length     0                          value constructor     Array  amp  amp  value length     0                         return undefined                                   return value                  This will filter out all the invalid fields recursively

User · Answer

isEmpty for value any type     eslint-disable no-nested-ternary     const isEmpty   value   gt      switch  typeof value        case  undefined         return true      case  object         return value     null           true           Array isArray value             value length           Object entries value  length     0  amp  amp  value constructor     Object      case  string         return  value length      default        return false

User · Answer

You can use Underscore js     isEmpty         true

User · Answer

That s similar way of how it gets checked in lodash source for object    const isEmpty   value   gt      for  const key in value        if  hasOwnProperty call value  key           return false             return true      But there are many other ways to do that

User · Answer

For those of you who have the same problem but use jQuery  you can use jQuery isEmptyObject

User · Answer

The new Way to check value is    if Object entries this props myarticle  length   0        here myarticles is object

User · Answer

You could check for the count of the Object keys   if  Object keys a  length  gt  0           not empty

User · Answer

Mostly what you want to know is  if the object has properties before using it  So instead of asking isEmpty and then always check the negation like if  isEmpty obj   you can just test if the object is not null and has properties instead export function hasProperties obj   boolean     return obj  amp  amp  obj constructor     Object  amp  amp  Object keys obj  length  gt   1

User · Answer

2021 - solution What you need is Object entries obj  length  It s not good to touch in native prototype  You can just create your own function and use it as you want  In my case I have a folder called utils where I have a module definition like this  utils isEmpty js export default  obj    gt   Object entries obj  length  someFileToUse js import isEmpty from    utils isEmpty js   const obj1       const obj2    somekey   quot someValue quot     console log isEmpty obj1       - gt  true  console log isEmpty obj2       - gt  false

User · Answer

I was returning an empty JSON response for an AJAX call and in IE8 jQuery isEmptyObject   was not validating correctly  I added an additional check that seems to catch it properly    done function data             Parse json response object     var response   jQuery parseJSON data           In IE 8 isEmptyObject doesn t catch the empty response  so adding additional undefined check     if jQuery isEmptyObject response     response length     0                  empty           else                 not empty

User · Answer

As of jQuery 1 4 isEmptyObject   method checks both properties on the object itself and properties inherited from prototypes  in that it doesn t use hasOwnProperty   The argument should always be a plain JavaScript Object as other types of object  DOM elements  primitive strings numbers  host objects  may not give consistent results across browsers  To determine if an object is a plain JavaScript object  use   isPlainObject     jQuery isPlainObject        true  jQuery isPlainObject   test       false   Jquery api

User · Answer

Caveat  Beware of JSON s limitiations   javascript    obj    f function           alert   Beware   obj is NOT empty  n nobj      f function                             n nJSON stringify  obj   n nreturns n n                            JSON stringify  obj        displays       Beware   obj is NOT empty       obj      f function             JSON stringify  obj        returns

User · Answer

I ve created a complete function to determine if object is empty   It uses Object keys from ECMAScript 5  ES5  functionality if possible to achieve the best performance  see compatibility table  and fallbacks to the most compatible approach for older engines  browsers    Solution         Returns true if specified object has no properties     false otherwise         param  object  object     returns  boolean      function isObjectEmpty object        if   object      typeof object            throw new Error  Object must be specified                if  null     object            return true             if   undefined      Object keys               Using ECMAScript 5 feature          return  0     Object keys object  length         else              Using legacy compatibility mode          for  var key in object                if  object hasOwnProperty key                     return false                                  return true            Here s the Gist for this code   And here s the JSFiddle with demonstration and a simple test   I hope it will help someone  Cheers

User · Answer

Just a workaround  Can your server generate some special property in case of no data   For example   var a    empty true     Then you can easily check it in your AJAX callback code  Another way to check it   if  a toSource                   then  a  is empty    EDIT  If you use any JSON library  f e  JSON js  then you may try JSON encode   function and test the result against empty value string

User · Answer

you can use this simple code that did not use jQuery or other libraries  var a          check is an empty object if JSON stringify a               alert  it is empty      else       alert  it is not empty        JSON class and it s functions  parse and stringify  are very usefull but has some problems with IE7 that you can fix it with this simple code http   www json org js html   Other Simple Way  simplest Way    you can use this way without using jQuery or JSON object   var a        function isEmptyObject obj        if typeof obj   object               it is not object  so is not empty         return false        else           var x i 0          for x in obj                i                      if i gt 0                  this object has some properties or methods             return false            else                 this object has not any property or method             return true                     alert isEmptyObject a         true is alerted

User · Answer

jQuery have special function isEmptyObject   for this case   jQuery isEmptyObject        true jQuery isEmptyObject   foo   bar        false   Read more on http   api jquery com jQuery isEmptyObject

User · Answer

To really accept ONLY     the best way to do it in Javascript using Lodash is     isEmpty value   amp  amp    isPlainObject value

User · Answer

Best one-liner solution I could find  updated    x000D   x000D  isEmpty   obj   gt   Object values obj  filter e   gt  typeof e      undefined   length   console log isEmpty                                                true console log isEmpty  a  undefined  b  undefined                    true console log isEmpty  a  undefined  b  void 1024  c  void 0         true  console log isEmpty  a   undefined  undefined                      false console log isEmpty  a  1                                          false console log isEmpty  a                                             false console log isEmpty  a  null  b  undefined                         false x000D   x000D   x000D

User · Answer

You can define you own object prototype  just before its usage or at the beginning of your code   The definition should look like this    x000D   x000D  Object prototype hasOwnProperties   function   x000D     x000D    for  var k in this  x000D       x000D      if   this hasOwnProperty k    x000D         x000D        return true  x000D         x000D      x000D    return false  x000D    x000D   x000D   x000D    Here is a usage example    x000D   x000D  var a       x000D   x000D  while   a status      finished    x000D      x000D    if   status      processing    x000D      x000D      a status    finished     x000D      x000D     x000D    if   status      starting    x000D      x000D      a status    processing     x000D      x000D     x000D    if    a hasOwnProperties     x000D      x000D      a status    starting   x000D      x000D    x000D   x000D   x000D    Enjoy   -

User · Answer

As per the ES2017 specification on Object entries    the check is simple using any modern browser--  Object entries     length     0

User · Answer

I would go for checking if it has at least one key  That would suffice to tell me that it s not empty  Boolean Object keys obj        0      obj       checks for undefined

User · Answer

I can t believe after two years of programming js it never clicked that empty objects and array s aren t falsey  the weirdest thing is it never caught me out   this will return true if the input is falsey by default or if it s an empty object or array  the inverse is the trueish function  http   codepen io synthet1c pen pjmoWL  function falsish  obj        if   typeof obj      number   amp  amp  obj  gt  0     obj     true            return false            return   obj            Object keys  obj   length           true     function trueish  obj        return  falsish  obj       falsish                   gt  true falsish  foo  bar         gt  false falsish                   gt  true falsish   foo             gt  false falsish false             gt  true falsish true              gt  false    the rest are on codepen

User · Answer

isEmpty   function obj          if  obj    null  return true        if  obj constructor name     Array     obj constructor name     String   return obj length     0        for  var key in obj  if  isEmpty obj key    return true        return false          This will check the emptiness of String  Array or Object  Maps    Usage     var a     a   xxx   b   1   c    c a       isEmpty a      true  because a c c a is empty  isEmpty  I am a String      false

User · Answer

Under the hood all empty check methods in all libraries use object keys checking logic  Its an odd way to make it understandable  which you can put in a method  Described here   for key in obj        your work here   break      Which has evolved in ES5  now put simply you can check the object s keys length  using Object Keys method which takes your object as it s parameter   if Object keys obj  length  gt  0      do your work here     Or if you are using Lodash  you must be  then      isEmpty obj      true or false

User · Answer

My take   x000D   x000D  function isEmpty obj      return Object keys obj  length     0     var a       a  1    b  2   var b       console log isEmpty a       false console log isEmpty b       true x000D   x000D   x000D   Just  I don t think all browsers implement Object keys   currently

User · Answer

Here is a fast  simple  function   function isEmptyFunction        for  const i in this  return false   return true     Implemented as a getter   Object defineProperty Object prototype   isEmpty     get  isEmptyFunction     console log    isEmpty     true   Implemented as a separate function   const isEmpty   Function prototype call bind isEmptyFunction   console log isEmpty         true

User · Answer

Sugar JS provides extended objects for this purpose  The code is clean and simple   Make an extended object   a   Object extended       Check it s size   a size

User · Answer

I just ran into a similar situation  I didn t want to use JQuery  and wanted to do this using pure Javascript   And what I did was  used the following condition  and it worked for me   var obj       if JSON stringify obj                This will check if the object is empty      Code here       For not equal to  use this   JSON stringify obj            Check out this JSFiddle

User · Answer

There is a simple way if you are on a newer browser  Object keys obj  length    0

User · Answer

Performance  Today 2020 01 17 I perform tests on MacOs HighSierra 10 13 6 on Chrome v79 0  Safari v13 0 4 and Firefox v72 0  for chosen solutions    Conclusions   solutions based on for-in  A J L M  are fastest  solutions based on JSON stringify  B K  are slow surprisingly also solution based on Object  N  is slow     Details  Below in snippet are presented 15 solutions  If you want to run performance test on your machine click HERE    x000D   x000D  var log    s f    gt  console log    s  -- gt       f        k 2    f  k 2       x000D   x000D  function A obj    x000D    for var i in obj  return false   x000D    return true  x000D    x000D   x000D  function B obj    x000D    return JSON stringify obj            x000D    x000D   x000D  function C obj    x000D    return Object keys obj  length     0  x000D    x000D   x000D  function D obj    x000D    return Object entries obj  length     0  x000D    x000D   x000D  function E obj    x000D    return Object getOwnPropertyNames obj  length     0  x000D    x000D   x000D  function F obj    x000D    return Object keys obj  length     0  amp  amp  obj constructor     Object  x000D    x000D   x000D  function G obj    x000D    return typeof obj      undefined      Boolean Object keys obj  0    x000D    x000D   x000D  function H obj    x000D    return Object entries obj  length     0  amp  amp  obj constructor     Object  x000D    x000D   x000D  function I obj    x000D    return Object values  obj    every  val   gt  typeof val      undefined     x000D    x000D   x000D  function J obj    x000D    for  const key in obj    x000D      if  hasOwnProperty call obj  key     x000D        return false x000D        x000D      x000D    return true  x000D    x000D   x000D  function K obj    x000D    for var prop in obj    x000D      if obj hasOwnProperty prop     x000D        return false  x000D        x000D      x000D   x000D    return JSON stringify obj     JSON stringify      x000D    x000D   x000D  function L obj    x000D    for var prop in obj    x000D      if obj hasOwnProperty prop   x000D        return false  x000D      x000D   x000D    return true  x000D    x000D   x000D  function M obj    x000D    for  var k in obj  x000D       x000D      if   obj hasOwnProperty k    x000D         x000D        return false  x000D         x000D      x000D    return true   x000D    x000D   x000D  function N obj    x000D    return Object getOwnPropertyNames obj  length     0  amp  amp  x000D    Object getOwnPropertySymbols obj  length     0  amp  amp  x000D    Object getPrototypeOf obj      Object prototype   x000D    x000D   x000D  function O obj    x000D    return   Object getOwnPropertyNames    undefined   Object getOwnPropertyNames obj  length    0    function   for var key in obj  break  return  key    null   amp  amp   key    undefined        x000D    x000D   x000D  log  A  A   x000D  log  B  B   x000D  log  C  C   x000D  log  D  D   x000D  log  E  E   x000D  log  F  F   x000D  log  G  G   x000D  log  H  H   x000D  log  I  I   x000D  log  J  J   x000D  log  K  K   x000D  log  L  L   x000D  log  M  M   x000D  log  N  N   x000D  log  O  O   x000D   x000D   x000D

User · Answer

It s weird that I haven t encountered a solution that compares the object s values as opposed to the existence of any entry  maybe I missed it among the many given solutions   I would like to cover the case where an object is considered empty if all its values are undefined   x000D   x000D      const isObjectEmpty   obj   gt  Object values obj  every val   gt  typeof val      undefined        console log isObjectEmpty                                         true     console log isObjectEmpty   foo  undefined  bar  undefined        true     console log isObjectEmpty   foo  false      bar  null             false x000D   x000D   x000D   Example usage Let s say  for the sake of example  you have a function  paintOnCanvas  that destructs values from its argument  x  y and size   If all of them are undefined  they are to be left out of the resulting set of options  If not they are not  all of them are included  function paintOnCanvas    brush  x  y  size        const baseOptions     brush     const areaOptions     x  y  size     const options   isObjectEmpty areaOptions    baseOptions        baseOptions  areaOptions

User · Answer

I know this doesn t answer 100  your question  but I have faced similar issues before and here s how I use to solve them   I have an API that may return an empty object  Because I know what fields to expect from the API  I only check if any of the required fields are present or not   For example   API returns    or  agentID   1234   required   address   1234 lane   opt        In my calling function  I ll only check   if response data  amp  amp  response data agentID       do something with my agentID    else      is empty response     This way I don t need to use those expensive methods to check if an object is empty  The object will be empty for my calling function if it doesn t have the agentID field

User · Answer

ECMA 5      because Object keys new Date    length     0     we have to do some additional check obj     null and undefined check  amp  amp  Object keys obj  length     0  amp  amp  obj constructor     Object  Note  though  that this creates an unnecessary array  the return value of keys   Pre-ECMA 5  function isEmpty obj      for var prop in obj        if obj hasOwnProperty prop           return false               return JSON stringify obj      JSON stringify         jQuery  jQuery isEmptyObject         true  lodash    isEmpty         true  Underscore    isEmpty         true  Hoek Hoek deepEqual             true  ExtJS Ext Object isEmpty         true  AngularJS  version 1  angular equals             true  Ramda R isEmpty         true

User · Answer

Using Object keys obj  length  as suggested above for ECMA 5   is 10 times slower for empty objects   keep with the old school  for   in  option   Tested under Node  Chrome  Firefox and IE 9  it becomes evident that for most use cases     for   in     is the fastest option to use   Object keys obj  length is 10 times slower for empty objects JSON stringify obj  length is always the slowest  not suprising  Object getOwnPropertyNames obj  length takes longer than Object keys obj  length can be much longer on some systems    Bottom line performance wise  use   function isEmpty obj        for  var x in obj    return false       return true      or  function isEmpty obj       for  var x in obj    if  obj hasOwnProperty x    return false       return true      See detailed testing results and test code at Is object empty

User · Answer

if Object getOwnPropertyNames obj  length     0       is empty     see http   bencollier net 2011 04 javascript-is-an-object-empty

User · Answer

I liked this one I came up with  with the help of some other answers here  Thought I d share it   x000D   x000D  Object defineProperty Object prototype   isEmpty         get             for var p in this                if  this hasOwnProperty p    return false                    return true              let users       let colors    primary   red    let sizes    sm  100  md  200  lg  300    console log    nusers     users    nusers isEmpty    gt      users isEmpty    n n------------- n     ncolors     colors    ncolors isEmpty    gt      colors isEmpty    n n------------- n     nsizes     sizes    nsizes isEmpty    gt      sizes isEmpty    n         x000D   x000D   x000D

User · Answer

A simpler solution  var a        Case a is empty   Object keys a  length returns true

User · Answer

If ECMAScript 5 support is available  you can use Object keys    function isEmpty obj        return Object keys obj  length     0     For ES3 and older  there s no easy way to do this  You ll have to loop over the properties explicitly  function isEmpty obj        for var prop in obj            if obj hasOwnProperty prop               return false             return true

User · Answer

Best way that I found   function isEmpty obj        if   obj                return true             if    typeof obj       number    amp  amp   Object keys obj  length                return true             return false      Works for       t1     - gt  true     t2   0 1  -  false     t3     - gt  true     t4   2  - gt  false     t5  null - gt  true     t6  undefined - gt  true     t7     - gt  true     t8   a  - gt  false     t9  0 - gt  true     t10  1 - gt  false

User · Answer

Another alternative is to use is js  14kB  as opposed to jquery  32kB   lodash  50kB   or underscore  16 4kB   is js proved to be the fastest library among aforementioned libraries that could be used to determine whether an object is empty   http   jsperf com check-empty-object-using-libraries  Obviously all these libraries are not exactly the same so if you need to easily manipulate the DOM then jquery might still be a good choice or if you need more than just type checking then lodash or underscore might be good  As for is js  here is the syntax   var a       is empty a      true is empty   hello    world       false   Like underscore s and lodash s   isObject    this is not exclusively for objects but also applies to arrays and strings   Under the hood this library is using Object getOwnPropertyNames which is similar to Object keys but Object getOwnPropertyNames is a more thorough since it will return enumerable and non-enumerable properties as described here   is empty   function value        if is object value            var num   Object getOwnPropertyNames value  length          if num     0     num     1  amp  amp  is array value       num     2  amp  amp  is arguments value                 return true                    return false        else           return value                    If you don t want to bring in a library  which is understandable  and you know that you are only checking objects  not arrays or strings  then the following function should suit your needs   function isEmptyObject  obj         return Object getOwnPropertyNames obj  length     0      This is only a bit faster than is js though just because you aren t checking whether it is an object

User · Answer

Old question  but just had the issue  Including JQuery is not really a good idea if your only purpose is to check if the object is not empty  Instead  just deep into JQuery s code  and you will get the answer   function isEmptyObject obj        var name      for  name in obj            if  obj hasOwnProperty name                 return false                      return true

User · Answer

This is what I came up with  to tell if there are any non-null values in the object   function isEmpty obj  Object   Boolean       for  const prop in obj            if  obj hasOwnProperty prop                 if  obj prop  instanceof Object                    const rtn   this isEmpty obj prop                    if  rtn     false                      return false                                  else if  obj prop     obj prop      false                    return false                                    return true

User · Answer

In addition to Thevs answer   var o       alert   toJSON o             true  var o    a 1   alert   toJSON o             false   it s jquery   jquery json

User · Answer

Meanwhile we can have one function that checks for all  empties  like null  undefined                    x000D   x000D  var isEmpty   function data      if  typeof data       object         if  JSON stringify data              JSON stringify data                    return true        else if   data          return true            return false      else if  typeof data       string         if   data trim            return true            return false      else if  typeof data       undefined         return true      else       return false           Use cases and results   console log isEmpty        true console log isEmpty null       true console log isEmpty          true console log isEmpty            true console log isEmpty undefined       true console log isEmpty          true console log isEmpty          true console log isEmpty 0       false console log isEmpty  Hey        false x000D   x000D   x000D

User · Answer

1  Using Object keys Object keys will return an Array  which contains the property names of the object  If the length of the array is 0  then we know that the object is empty  function isEmpty obj        return Object keys obj  length     0  amp  amp  empty constructor     Object     We can also check this using Object values and Object entries  This is typically the easiest way to determine if an object is empty  2  Looping over object properties with for   in The for   in statement will loop through the enumerable property of object  function isEmpty obj        for var prop in obj            if obj hasOwnProperty prop               return false             return true     In the above code  we will loop through object properties and if an object has at least one property  then it will enter the loop and return false  If the object doesn   t have any properties then it will return true   3  Using JSON stringify If we stringify the object and the result is simply an opening and closing bracket  we know the object is empty  function isEmptyObject obj       return JSON stringify obj               4  Using jQuery jQuery isEmptyObject obj     5  Using Underscore and Lodash   isEmpty obj    Resource

User · Answer

If jQuery and the web browser is not available  there is also an isEmpty function in underscore js     isEmpty        returns true   Additionally  it does not assume the input parameter to be an object  For a list or string or undefined  it will also turn the correct answer

User · Answer

How about using JSON stringify  It is almost available in all modern browsers   function isEmptyObject obj       return JSON stringify obj

User · Answer

Pure Vanilla Javascript  and full backward compatibility   x000D   x000D  function isObjectDefined  Obj    x000D    if  Obj     null    typeof Obj      object     x000D      Object prototype toString call Obj        object Array      x000D      return false x000D      else   x000D      for  var prop in Obj    x000D        if  Obj hasOwnProperty prop     x000D          return true x000D          x000D        x000D      return JSON stringify Obj      JSON stringify     x000D      x000D    x000D   x000D  console log isObjectDefined       false x000D  console log isObjectDefined         false x000D  console log isObjectDefined 1      false x000D  console log isObjectDefined  string       false x000D  console log isObjectDefined NaN      false x000D  console log isObjectDefined null      false x000D  console log isObjectDefined         false x000D  console log isObjectDefined         false x000D  console log isObjectDefined  a           true x000D   x000D   x000D

User · Answer

We can check with vanilla js with handling null or undefined check also as follows   x000D   x000D  function isEmptyObject obj      return   obj  amp  amp  Object keys obj  length     0  amp  amp  obj constructor     Object       tests  isEmptyObject new Boolean         false  isEmptyObject new Array           false  isEmptyObject new RegExp          false  isEmptyObject new String          false  isEmptyObject new Number          false  isEmptyObject new Function        false  isEmptyObject new Date            false isEmptyObject null               false isEmptyObject undefined          false isEmptyObject                    true x000D   x000D   x000D

User · Answer

Perfect and failsafe solution  I think the first accepted solution works in most cases but is not Failsafe   The better and failsafe solution will be    function isEmptyObject        return toString call obj        object Object       amp  amp  Object keys obj  length     0      or in ES6 7  const isEmptyObject        gt  toString call obj        object Object       amp  amp  Object keys obj  length     0    With this approach if the obj is set to undefined or null  the code does not break  and return null

User · Answer

export function isObjectEmpty obj      return       Object keys obj  length     0  amp  amp      Object getOwnPropertySymbols obj  length     0  amp  amp      obj constructor     Object          This include checking for objects containing symbol properties   Object keys does not retrieve symbol properties

[javascript] How do I test for an empty JavaScript object?

Examples related to javascript

Examples related to javascript-objects