How to check if an object is empty? [javascript]

Question

I need to evaluate if an object is empty.

For example suppose I have an object:

var home = ....;     // this is an object and after I print it

console.log(home)    // the result of this option is []

//now I need to check if a object is empty or null
if( home == null || home == undefined )
{
    // I don't know specify how object is empty
}

How can I detect whether or not the above object home is null/empty?

if I try home.length gives me an error "length is undefined" — user6045391
– user6045391, Commented Mar 10, 2016 at 14:48

Andy · Accepted Answer · 2016-03-10 14:57:34Z

2

To check for an empty array

if (!arr.length) {
  // if the array is empty
}

and for an object (check that it has no keys)

if (!Object.keys(obj).length) {
  // if the object is empty
}

DEMO

answered Mar 10, 2016 at 14:57

Andy

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3 Comments

user6045391 Over a year ago

I use all two method and I have the same error, but the vector that I use it is result from var vet = $(this).find('...').map(function() { return { 'name': this.id, 'value': this.value }; }).get();

user6045391 Over a year ago

when the fields are the value the problem doesn't exist,but when I leave the fields empty I have this problem!

Andy Over a year ago

At the risk of repeating myself, add the relevant code/HTML to your question. You're now asking about jQuery which doesn't get a mention in your question. If you don't give us all the information, how can we help you?

capqch · Accepted Answer · 2016-03-10 15:00:25Z

0

Only way I see so far may be ({}).toSource() === o.toSource()

Example:

var y = {a: 't'};
window.console.log(({}).toSource() === y.toSource());
delete y.a;
window.console.log(({}).toSource() === y.toSource());

EDIT : Oh, nicely found, Andy.

answered Mar 10, 2016 at 15:00

capqch

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