To get the length of a javascript object

Question

If I have a JavaScript object, say

data
:
Array[1]
 0
 :
 Object
  section
  :
  Array[6]
  tool
  :
  Array[6]
  wellcon
  :
  Array[6]
  welltra
  Array[6]

from this how i get the section length. i try like

data.section.length

but this is wrong. what is the wrong in my syntax?

Answer 1

Try data[0].section.length I think it is answer

Answer 2

Try this one

 Object.keys(data).length

or you can find it in another way

Object.size = function(obj) {
var size = 0, key;
for (key in obj) {
    if (obj.hasOwnProperty(key)) size++;
}
return size;
};

var size = Object.size(data);//length of the data

Answer 3

I guess you are looking for this:

Object.keys(data.section).length

or

Object.entries(data.section).length

but this way is experimental thing, described here