Add an attribute to a json object using spread operator

The Spread Operator is ”…” three dots, which allows to extend an object.

Code for adding attributes to an existing json object:

var parts = ['shoulders', 'knees'];
var lyrics = ['head', ...parts, 'and', 'toes']; // ["head", "shoulders", "knees", "and", "toes"]

You can also extend the same object also:

parts =  [...parts, 'and', 'toes'];