Arrays

##Methods

1. compact
2. select
3. include
4. flatten
5. any
6. empty
7. first
8. last
9. find

###compact

Removes all undefined, null, or empty strings from an array

[1, 2, undefined, 3, "", null, 4].compact
-> [1, 2, 3, 4]

###select

Returns a new array of all values for which the predicate returns true

[1, 2, 3, 4, 5].select(value => value % 2 === 0);

-> [2, 4]

###include

Returns true if value is in array, otherwise returns false.

[1, 2, 3, 4, 5].include(4);

-> true

###flatten

Flattens a deeply nested array of arrays

[1, [2, 3, [4, 5, 6]]].flatten;

-> [1, 2, 3, 4, 5, 6]

###any

Returns true if an array is not empty

[1].any
-> true

[].any
-> false

[null, undefined, ""].any
-> false

###empty

Returns true if an array is empty (or if it only contains null, undefined, or empty strings)

[].empty
-> true

[1].empty
-> false

[null, "", undefined].empty
-> true

###first

Gets first x items from an array

var array = ["t", "e", "s", "t"];
array.first() // -> ['t']
array.first(2) // -> ['t', 'e']

###last

Gets last x items from an array

var array = [1,2,3,4];
array.last() // -> [4]
array.first(2) // -> [3,4]

###find

Finds the first value in array for which the predicate returns true, otherwise returns undefined

[1, 2, 3, 4].find((value) => v === 3)
-> 3

[1, 2, 3, 4].find((value) => v === 9)
-> undefined