# Playing with arrays

## Check if all array elements are equals

```ruby
arr = [0, 0, 0, 0, 0, 0, 0]
puts true if arr.uniq.length == 1
```

## Array includes a sub array

```ruby
(subarray & array) == array
```

## Compute values occurences

```ruby
[1, 1, 2, 3, 4, 5, 5, 5, 5].tally
=> {1=>2, 2=>1, 3=>1, 4=>1, 5=>4}
```