How do I test for an empty JavaScript object?
JavascriptJavascript ObjectsJavascript Problem Overview
After an AJAX request, sometimes my application may return an empty object, like:
var a = {};
How can I check whether that's the case?
Javascript Solutions
Solution 1 - Javascript
// because Object.keys(new Date()).length === 0;
// we have to do some additional check
obj // 👈 null and undefined check
&& Object.keys(obj).length === 0
&& Object.getPrototypeOf(obj) === Object.prototype
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(Object.prototype.hasOwnProperty.call(obj, prop)) {
return false;
}
}
return JSON.stringify(obj) === JSON.stringify({});
}
jQuery.isEmptyObject({}); // true
_.isEmpty({}); // true
_.isEmpty({}); // true
Hoek.deepEqual({}, {}); // true
Ext.Object.isEmpty({}); // true
angular.equals({}, {}); // true
R.isEmpty({}); // true
Solution 2 - Javascript
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;
}
Solution 3 - Javascript
For those of you who have the same problem but use jQuery, you can use jQuery.isEmptyObject.
Solution 4 - Javascript
Performance
Today 2020.01.17, I performed tests on macOS High Sierra 10.13.6 on Chrome v79.0, Safari v13.0.4, and Firefox v72.0; for the chosen solutions.
Conclusions
- Solutions based on
for-in
(A, J, L, M) are fastest - Solutions based on
JSON.stringify
(B, K) are slow - Surprisingly, the solution based on
Object
(N) is also slow - NOTE: This table does not match the photo below.
Details
There are 15 solutions presented in the snippet below. If you want to run a performance test on your machine, click HERE. This link was updated 2021.07.08, but tests originally were performed here - and results in the table above came from there (but now it looks like that service no longer works).
var log = (s, f) => console.log(`${s} --> {}:${f({})} {k:2}:${f({ k: 2 })}`);
function A(obj) {
for (var i in obj) return false;
return true;
}
function B(obj) {
return JSON.stringify(obj) === "{}";
}
function C(obj) {
return Object.keys(obj).length === 0;
}
function D(obj) {
return Object.entries(obj).length === 0;
}
function E(obj) {
return Object.getOwnPropertyNames(obj).length === 0;
}
function F(obj) {
return Object.keys(obj).length === 0 && obj.constructor === Object;
}
function G(obj) {
return typeof obj === "undefined" || !Boolean(Object.keys(obj)[0]);
}
function H(obj) {
return Object.entries(obj).length === 0 && obj.constructor === Object;
}
function I(obj) {
return Object.values(obj).every((val) => typeof val === "undefined");
}
function J(obj) {
for (const key in obj) {
if (hasOwnProperty.call(obj, key)) {
return false;
}
}
return true;
}
function K(obj) {
for (var prop in obj) {
if (obj.hasOwnProperty(prop)) {
return false;
}
}
return JSON.stringify(obj) === JSON.stringify({});
}
function L(obj) {
for (var prop in obj) {
if (obj.hasOwnProperty(prop)) return false;
}
return true;
}
function M(obj) {
for (var k in obj) {
if (obj.hasOwnProperty(k)) {
return false;
}
}
return true;
}
function N(obj) {
return (
Object.getOwnPropertyNames(obj).length === 0 &&
Object.getOwnPropertySymbols(obj).length === 0 &&
Object.getPrototypeOf(obj) === Object.prototype
);
}
function O(obj) {
return !(Object.getOwnPropertyNames !== undefined
? Object.getOwnPropertyNames(obj).length !== 0
: (function () {
for (var key in obj) break;
return key !== null && key !== undefined;
})());
}
log("A", A);
log("B", B);
log("C", C);
log("D", D);
log("E", E);
log("F", F);
log("G", G);
log("H", H);
log("I", I);
log("J", J);
log("K", K);
log("L", L);
log("M", M);
log("N", N);
log("O", O);
Solution 5 - Javascript
You can use Underscore.js.
_.isEmpty({}); // true
Solution 6 - Javascript
if(Object.getOwnPropertyNames(obj).length === 0){
//is empty
}
see http://bencollier.net/2011/04/javascript-is-an-object-empty/
Solution 7 - Javascript
How about using JSON.stringify? It is almost available in all modern browsers.
function isEmptyObject(obj){
return JSON.stringify(obj) === '{}';
}
Solution 8 - Javascript
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;
}
Solution 9 - Javascript
There is a simple way if you are on a newer browser.
Object.keys(obj).length == 0
Solution 10 - Javascript
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 https://stackoverflow.com/questions/4994201/is-object-empty/34491287#34491287
Solution 11 - Javascript
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;
Update
OR
you can use the jQuery implementation of isEmptyObject
function isEmptyObject(obj) {
var name;
for (name in obj) {
return false;
}
return true;
}
Solution 12 - Javascript
My take:
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
Just, I don't think all browsers implement Object.keys()
currently.
Solution 13 - Javascript
- 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.
Solution 14 - Javascript
function isEmpty(obj) {
for(var i in obj) { return false; }
return true;
}
Solution 15 - Javascript
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.
const isEmpty = (obj) => {
if (obj === null ||
obj === undefined ||
Array.isArray(obj) ||
typeof obj !== 'object'
) {
return true;
}
return Object.getOwnPropertyNames(obj).length === 0;
};
console.clear();
console.log('-----');
console.log(isEmpty('')); // true
console.log(isEmpty(33)); // true
console.log(isEmpty([])); // true
console.log(isEmpty({})); // true
console.log(isEmpty({ length: 0, custom_property: [] })); // false
console.log('-----');
console.log(isEmpty('Hello')); // true
console.log(isEmpty([1, 2, 3])); // true
console.log(isEmpty({ test: 1 })); // false
console.log(isEmpty({ length: 3, custom_property: [1, 2, 3] })); // false
console.log('-----');
console.log(isEmpty(new Date())); // true
console.log(isEmpty(Infinity)); // true
console.log(isEmpty(null)); // true
console.log(isEmpty(undefined)); // true
Solution 16 - Javascript
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/
Solution 17 - Javascript
The correct answer is:
const isEmptyObject = obj =>
Object.getOwnPropertyNames(obj).length === 0 &&
Object.getOwnPropertySymbols(obj).length === 0 &&
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 {}
.
Solution 18 - Javascript
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
{}
Solution 19 - Javascript
In addition to Thevs answer:
var o = {};
alert($.toJSON(o)=='{}'); // true
var o = {a:1};
alert($.toJSON(o)=='{}'); // false
it's jquery + jquery.json
Solution 20 - Javascript
IsEmpty Object, unexpectedly lost its meaning i.e.: it's programming semantics, when our famous guru from Yahoo introduced the customized non-enumerable Object properties to ECMA and they got accepted.
[ If you don't like history - feel free to skip right to the working code ]
I'm seeing lots of good answers \ solutions to this question \ problem. However, grabbing the most recent extensions to ECMA Script is not the honest way to go. We used to hold back the Web back in the day to keep Netscape 4.x, and Netscape based pages work and projects alive, which (by the way) were extremely primitive backwards and idiosyncratic, refusing to use new W3C standards and propositions [ which were quite revolutionary for that time and coder friendly ] while now being brutal against our own legacy.
Killing Internet Explorer 11 is plain wrong! Yes, some old warriors that infiltrated Microsoft remaining dormant since the "Cold War" era, agreed to it - for all the wrong reasons. - But that doesn't make it right!
Making use, of a newly introduced method\property in your answers and handing it over as a discovery ("that was always there but we didn't notice it"), rather than a new invention (for what it really is), is somewhat 'green' and harmful. I used to make such mistakes some 20 years ago when I still couldn't tell what's already in there and treated everything I could find a reference for, as a common working solution...
Backward compatibility is important !
We just don't know it yet. That's the reason I got the need to share my 'centuries old' generic solution which remains backward and forward compatible to the unforeseen future.
There were lots of attacks on the in operator but I think the guys doing that have finally come to senses and really started to understand and appreciate a true Dynamic Type Language such as JavaScript and its beautiful nature.
My methods aim to be simple and nuclear and for reasons mentioned above, I don't call it "empty" because the meaning of that word is no longer accurate. Is Enumerable, seems to be the word with the exact meaning.
function isEnum( x ) { for( var p in x )return!0; return!1 };
Some use cases:
isEnum({1:0})
true
isEnum({})
false
isEnum(null)
false
Thanks for reading!
Solution 21 - Javascript
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()
Solution 22 - Javascript
Pure Vanilla Javascript, and full backward compatibility
function isObjectDefined (Obj) {
if (Obj === null || typeof Obj !== 'object' ||
Object.prototype.toString.call(Obj) === '[object Array]') {
return false
} else {
for (var prop in Obj) {
if (Obj.hasOwnProperty(prop)) {
return true
}
}
return JSON.stringify(Obj) !== JSON.stringify({})
}
}
console.log(isObjectDefined()) // false
console.log(isObjectDefined('')) // false
console.log(isObjectDefined(1)) // false
console.log(isObjectDefined('string')) // false
console.log(isObjectDefined(NaN)) // false
console.log(isObjectDefined(null)) // false
console.log(isObjectDefined({})) // false
console.log(isObjectDefined([])) // false
console.log(isObjectDefined({a: ''})) // true
Solution 23 - Javascript
To really accept ONLY {}
, the best way to do it in Javascript using Lodash is:
_.isEmpty(value) && _.isPlainObject(value)
Solution 24 - Javascript
Best one-liner solution I could find (updated):
isEmpty = obj => !Object.values(obj).filter(e => 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
Solution 25 - Javascript
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 && 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);
Solution 26 - Javascript
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 && is.array(value)) || (num === 2 && 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.
Solution 27 - Javascript
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:
const isObjectEmpty = obj => Object.values(obj).every(val => typeof val === "undefined")
console.log(isObjectEmpty({})) // true
console.log(isObjectEmpty({ foo: undefined, bar: undefined })) // true
console.log(isObjectEmpty({ foo: false, bar: null })) // false
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 }
// ...
}
Solution 28 - Javascript
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 && 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.
Solution 29 - Javascript
We can check with vanilla js with handling null or undefined check also as follows,
function isEmptyObject(obj) {
return !!obj && Object.keys(obj).length === 0 && 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
Solution 30 - Javascript
I liked this one I came up with, with the help of some other answers here. Thought I'd share it.
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 ==> ' + users.isEmpty,
'\n\n-------------\n',
'\ncolors =', colors,
'\ncolors.isEmpty ==> ' + colors.isEmpty,
'\n\n-------------\n',
'\nsizes =', sizes,
'\nsizes.isEmpty ==> ' + sizes.isEmpty,
'\n',
''
);
Solution 31 - Javascript
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
Solution 32 - Javascript
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' && obj > 0) || obj === true ){
return false;
}
return !!obj
? !Object.keys( obj ).length
: true;
}
function trueish( obj ){
return !falsish( obj );
}
falsish({}) //=> true
falsish({foo:'bar'}) //=> false
falsish([]) //=> true
falsish(['foo']) //=> false
falsish(false) //=> true
falsish(true) //=> false
// the rest are on codepen
Solution 33 - Javascript
export function isObjectEmpty(obj) {
return (
Object.keys(obj).length === 0 &&
Object.getOwnPropertySymbols(obj).length === 0 &&
obj.constructor === Object
);
}
This include checking for objects containing symbol properties.
Object.keys does not retrieve symbol properties.
Solution 34 - Javascript
The new Way to check value is if(Object.entries(this.props.myarticle).length===0){ }
here myarticles is object
Solution 35 - Javascript
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 && obj.constructor === Object && Object.keys(obj).length >= 1;
}
Solution 36 - Javascript
isEmptyObject(value) {
return value && value.constructor === Object && Object.keys(value).length === 0;
}
The above code is enough to check the empty-ness of an Object.
A very good article is written at how-to-check-if-object-is-empty
Solution 37 - Javascript
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
Solution 38 - Javascript
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
}
});
Solution 39 - Javascript
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
Solution 40 - Javascript
You can define you own object prototype, just before its usage or at the beginning of your code.
The definition should look like this:
Object.prototype.hasOwnProperties = function()
{
for (var k in this)
{
if ( this.hasOwnProperty(k) )
{
return true;
}
}
return false;
}
Here is a usage example:
var a = {};
while ( a.status !== "finished" )
{
if ( status === "processing" )
{
a.status = "finished";
}
if ( status === "starting" )
{
a.status = "processing";
}
if ( !a.hasOwnProperties() )
{
a.status = "starting";
}
}
Enjoy! :-)
Solution 41 - Javascript
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;
}
Solution 42 - Javascript
That's similar way of how it gets checked in lodash source for object :
const isEmpty = value => {
for (const key in value) {
if (hasOwnProperty.call(value, key)) {
return false
}
}
return true;
}
But there are many other ways to do that.
Solution 43 - Javascript
isEmpty for value any type
/* eslint-disable no-nested-ternary */
const isEmpty = value => {
switch (typeof value) {
case 'undefined':
return true;
case 'object':
return value === null
? true
: Array.isArray(value)
? !value.length
: Object.entries(value).length === 0 && value.constructor === Object;
case 'string':
return !value.length;
default:
return false;
}
};
Solution 44 - Javascript
let jsObject = JSON.parse(JSON.stringify(obj), (key, value) => {
if (value === null ||
value === '' ||
(value.constructor === Object && Object.entries(value).length === 0) ||
(value.constructor === Array && value.length === 0)) {
return undefined
}
return value
})
This will filter out all the invalid fields recursively.
Solution 45 - Javascript
You can use lodash library instead of making a plain JS function.
_.isEmpty({}) // true
This will check array and object either they do have values and return boolean.
Solution 46 - Javascript
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
Solution 47 - Javascript
Try Destructuring
const a = {};
const { b } = a;
const emptryOrNot = (b) ? 'not Empty' : 'empty';
console.log(emptryOrNot)
Solution 48 - Javascript
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]"
&& Object.keys(obj).length === 0;
}
or in ES6/7
const isEmptyObject = () => toString.call(obj) === "[object Object]"
&& 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.