Count length of array of array using javascript

Question

I have this array and I want to count total numbers into this, can anyone please let me know how can i achieve this using pure javascript

var total = {
    "numbers":{
        "1":"9897877884",
        "2":"9867543234",
        "3":"7898879900",
        "4":"1234567890"
    }
}

This is not an array of array. This is an object with a property that is also an object. — GolezTrol
– GolezTrol, Commented Jun 15, 2016 at 11:36
Ohk, so i was searching in stackoverflow about this was totally wrong — Kirankumar Dafda
– Kirankumar Dafda, Commented Jun 15, 2016 at 11:37

Nina Scholz · Accepted Answer · 2016-06-15 11:46:06Z

6

You could use Object.keys(total.numbers).length. The first part returns an array with the keys and the second gets the length of it.

var total = { "numbers": { "1": "9897877884", "2": "9867543234", "3": "7898879900", "4": "1234567890" } };
console.log(Object.keys(total.numbers).length);

Object.keys()

The Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).

Array#length

The length property represents an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.

edited Jun 15, 2016 at 11:46

answered Jun 15, 2016 at 11:36

Nina Scholz

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