Question

3

Check if a JSON array is empty

rated 0 times [ 9] [ 6] / answers: 1 / hits: 28208 / 11 Years ago, fri, august 23, 2013, 12:00:00

I know from the first look it sounds like duplicate question but i don't think it is...

I am receiving back a JSON array as:

var test1 = [] ;

or

var test2 = [{},{},{}] ;  //This is empty

I have no problem finding out if test1 is empty.

jQuery.isEmptyObject(test1)

My problem is with the test2...
Please note that in some cases the test2 might return something like:

var test2 = [{a:1},{},{}] ;  //All these are not empty

var test2 = [{},{a:1},{}] ;  //All these are not empty

var test2 = [{},{},{a:1}] ;  //All these are not empty

The above scenarios shouldn't be counted as empty.I've tried to use .length but it's not helping as the length is always 3... Any ideas?

Cheers.

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2 Years ago

answered 11 Years ago estefanib · Accepted Answer

function isArrayEmpty(array) {

    return array.filter(function(el) {

        return !jQuery.isEmptyObject(el);

    }).length === 0;

}

jsFiddle Demo

Passes all of your tests.

A pure JavaScript solution would be to replace !jQuery.isEmptyObject(el) with Object.keys(el).length !== 0

Edit: Using Array.prototype.every

function isArrayEmpty(array) {

    return array.every(function(el) {

        return jQuery.isEmptyObject(el);

    });

}