Ruby Double star (**)

```ruby
def hello(a, *b, **c)
  return a, b, c
end
```
`a` is a regular parameter. `*b` will take all the parameters passed after the first one and put them in an array. `**c` will take any parameter given in the format `key:` value at the end of the method call.

See the following examples:

One parameter

```ruby
hello(1)
# => [1, [], {}]
```
More than one parameter

```ruby
hello(1, 2, 3, 4)
# => [1, [2, 3, 4], {}]
```
More than one parameter + hash-style parameters

```ruby
hello(1, 2, 3, 4, a: 1, b: 2)
# => [1, [2, 3, 4], {:a=>1, :b=>2}]
```

Victor Velazquez
March 4, 2021