The Object.keys
method returns
an array of object properties in the
same order as when iterating through
a loop.
Syntax
let keys = Object.keys(object);
Example
Let's get properties of the following object:
let obj = {'a': 1, 'b': 2, 'c': 3};
console.log(Object.keys(obj));
The code execution result:
['a', 'b', 'c']
Example
And now put the properties in an object in random order:
let obj = {2: 'b', 1: 'a', 4: 'd', 3: 'c'};
console.log(Object.keys(obj));
After executing the code, we will see that the properties are sorted in ascending order:
['1', '2', '3', '4']
Example
Also, using the Object.keys
method,
you can get the positions of array elements:
let arr = ['a', 'b', 'c', 'd'];
console.log(Object.keys(arr));
The code execution result:
['0', '1', '2', '3']
See also
-
the
Object.values
method
that returns an array of object values -
the
Object.assign
method
that copies properties and values of an object