I have an array like this:
[{"this":"that","int":5},{"this":"that","int":5}]
How can I count the number of objects({}) inside of an array with Javascript?
Thanks in advance.
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1with Array#length? or do you mean the object?Nina Scholz– Nina Scholz2016-03-02 18:17:37 +00:00Commented Mar 2, 2016 at 18:17
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1Were you really not able to look up the Array.prototype.length property?Omri Aharon– Omri Aharon2016-03-02 18:19:41 +00:00Commented Mar 2, 2016 at 18:19
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5 Answers
[{"this":"that","int":5},{"this":"that","int":5}].length; // 2
2 Comments
Rajaprabhu Aravindasamy
@krmax44 You had a typo there. jsfiddle.net/52gp5wd2/1 And i thought you just want to count how many objects are there other than primitives,arrays etc...
krmax44
@JamesSnowy sorry, didn't typed it right in fiddle, but in the project, only the answer of RajaprabhuAravindasamy worked for me...
Try,
var cnt = 0;
var arr = [5 , 3 , "not an object" , {"this":"that","int":5},{"this":"that","int":5}];
arr.forEach(function(itm){
if(!itm.__proto__.__proto__){
cnt++;
}
});
console.log(cnt + "normal objects are there"); //2
answered Mar 2, 2016 at 18:19
Rajaprabhu Aravindasamy
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5 Comments
Rajaprabhu Aravindasamy
@krmax44 I glad that I understood your requirement. Try to accept it if you feel this answer has helped you. But this is not a compulsion. :)
mhodges
@RajaprabhuAravindasamy Great solution, glad you understood what the OP was trying to say - no one else did. I have edited the original post (pending approval) to improve clarity to direct people to your answer.
Asons
@mhodges Both the sample and text in the question shows nothing of an array with mixed item types. Changing it will invalidate all answers but this, so I changed it back. If that where what the OP was after, a new question needs to be posted.
mhodges
@LGSon Yeah, I don't think that the true intent was clearly communicated. Considering the fact that a simple .length did not work for the OP, I am guessing that the array is heterogeneous (or at least has the potential to be), which is why this solution is the only solution that worked.
Asons
@mhodges Still, one can't alter a posted question so it will invalidate the answers already given.
var length = arrayName.length;
Comments
Simply like this:
var yourArrayName = arrayName.length
As when you have an array and use the .length it counts how many objects there are in the array.
Comments
Object {} inside array [] treated as items so you find the length of array to count the item(s)
var $data=[{"this":"that","int":5},{"this":"that","int":5}];
var count=$data.length
3 Comments
Satish Kumar sonker
$data, just a variable name nothing else
Satish Kumar sonker
i am using this convention while declaring the variable, you can use your own convention
Brice Coustillas
You have a right to use any convention to declare a variable, but if so bear in mind that, in the case of the $ sign, some libraries (e.g. jQuery) may use it too, which could lead to confusion.