These are the equivalent of Hash Maps or Python Dictionaries for Nix.
Writing Methods
= for children
x = {
one = "hello";
two = "world";
three = 9;
}
. for children
x.one = "hello";
x.two = "world";
x.three = 9;
= to a set
x = {one = "hello"};
x = {two = "world"};
x = {three = 9};
Reading Children
x.one
// > "hello"