Javascript - Get array length from multi dimensional array

Question

How can you get the length of this kind of array using javascript or jquery?

var Accounts = {
'Account001' : { 'data1' : 'foo1', 'data2' : 'bar1' },
'Account002' : { 'data1' : 'foo2', 'data2' : 'bar2' },
'Account003' : { 'data1' : 'foo3', 'data2' : 'bar3' },
'Account004' : { 'data1' : 'foo4', 'data2' : 'bar4' }
};

I tried Accounts.length but it seems to return NAN.

http://stackoverflow.com/questions/5223/length-of-a-javascript-object As mentioned by @KarelG its an object, not an array. — Nevin Madhukar K, Mar 15 '17 at 08:21

score 10 · Accepted Answer · answered Mar 15 '17 at 08:22

10

Object.keys(Accounts).length

You are trying to get the "length" of an object, which does not exist. If this were an array, it would be enclosed in a bracket [].

This is definitely an object, so in order to count the properties inside an object, you would have to use Object.keys() to contain the property names in an array and then count the elements from there.

answered Mar 15 '17 at 08:22

Vic

703
6
9

Thanks this seems like the best solution for what i needed. – zeddex Mar 15 '17 at 09:13

score 2 · Answer 2 · answered Mar 15 '17 at 08:29

You can use a for loop to iterate over all the elements in the object and a count to get the number:

var Accounts = {
'Account001' : { 'data1' : 'foo1', 'data2' : 'bar1' },
'Account002' : { 'data1' : 'foo2', 'data2' : 'bar2' },
'Account003' : { 'data1' : 'foo3', 'data2' : 'bar3' },
'Account004' : { 'data1' : 'foo4', 'data2' : 'bar4' }
};

var count = 0;
for(var k in Accounts) {
  if(Accounts.hasOwnProperty(k)) {
    count++;
  }
}
console.log(count);

Javascript - Get array length from multi dimensional array

2 Answers2