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class Array
# Returns the tail of the array from +position+.
#
# %w( a b c d ).from(0) # => ["a", "b", "c", "d"]
# %w( a b c d ).from(2) # => ["c", "d"]
# %w( a b c d ).from(10) # => []
# %w().from(0) # => []
# %w( a b c d ).from(-2) # => ["c", "d"]
# %w( a b c ).from(-10) # => []
def from(position)
self[position, length] || []
end
# Returns the beginning of the array up to +position+.
#
# %w( a b c d ).to(0) # => ["a"]
# %w( a b c d ).to(2) # => ["a", "b", "c"]
# %w( a b c d ).to(10) # => ["a", "b", "c", "d"]
# %w().to(0) # => []
# %w( a b c d ).to(-2) # => ["a", "b", "c"]
# %w( a b c ).to(-10) # => []
def to(position)
if position >= 0
take position + 1
else
self[0..position]
end
end
# Returns a copy of the Array without the specified elements.
#
# people = ["David", "Rafael", "Aaron", "Todd"]
# people.without "Aaron", "Todd"
# # => ["David", "Rafael"]
#
# Note: This is an optimization of `Enumerable#without` that uses `Array#-`
# instead of `Array#reject` for performance reasons.
def without(*elements)
self - elements
end
# Equal to <tt>self[1]</tt>.
#
# %w( a b c d e ).second # => "b"
def second
self[1]
end
# Equal to <tt>self[2]</tt>.
#
# %w( a b c d e ).third # => "c"
def third
self[2]
end
# Equal to <tt>self[3]</tt>.
#
# %w( a b c d e ).fourth # => "d"
def fourth
self[3]
end
# Equal to <tt>self[4]</tt>.
#
# %w( a b c d e ).fifth # => "e"
def fifth
self[4]
end
# Equal to <tt>self[41]</tt>. Also known as accessing "the reddit".
#
# (1..42).to_a.forty_two # => 42
def forty_two
self[41]
end
# Equal to <tt>self[-3]</tt>.
#
# %w( a b c d e ).third_to_last # => "c"
def third_to_last
self[-3]
end
# Equal to <tt>self[-2]</tt>.
#
# %w( a b c d e ).second_to_last # => "d"
def second_to_last
self[-2]
end
end
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