We can get all the key-value pairs
of an object using Object.entries().
It returns the key-value pairs
as an array of arrays.
Consider the example given below:
In the example given above:
- 
Object.entries(person)returns an array in which
all the elements are also arrays.
In other words,Object.entries(person)returns an array with many
arrays nested in it.
 
- 
Each nested array contains
the key and the value of
a property of person,
in that same order.
The keys will be strings.
 
- 
Since the first property of personisfullName: "Adam Smith",
the first nested array
contains the elements -"fullName"and"Adam Smith".