how to find the length of the object in javascript code example

Example 1: javascript object length

var size = Object.keys(myObj).length;

Example 2: javascript get length of object

var person={
    "first_name":"Harry",
    "last_name":"Potter",
    "age":14
};
var personSize = Object.keys(person).length; //gets number of properties (3)

Example 3: can we find lenght of an object

Object.keys(myArray).length