blob: e5d1fb07959896265fe84c35bf18802a2ab2bc60 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
class Range
##
# call-seq:
# rng.first -> obj
# rng.first(n) -> an_array
#
# Returns the first object in the range, or an array of the first +n+
# elements.
#
# (10..20).first #=> 10
# (10..20).first(3) #=> [10, 11, 12]
#
def first(*args)
return self.begin if args.empty?
raise ArgumentError, "wrong number of arguments (given #{args.length}, expected 1)" unless args.length == 1
nv = args[0]
raise TypeError, "no implicit conversion from nil to integer" if nv.nil?
raise TypeError, "no implicit conversion of #{nv.class} into Integer" unless nv.respond_to?(:to_int)
n = nv.to_int
raise TypeError, "no implicit conversion of #{nv.class} into Integer" unless n.kind_of?(Integer)
raise ArgumentError, "negative array size (or size too big)" unless 0 <= n
ary = []
each do |i|
break if n <= 0
ary.push(i)
n -= 1
end
ary
end
end
|
