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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
class Array
# call-seq:
# array.shuffle!(random: Random) -> array
#
# Shuffles the elements of +self+ in place.
# a = [1, 2, 3] #=> [1, 2, 3]
# a.shuffle! #=> [2, 3, 1]
# a #=> [2, 3, 1]
#
# The optional +random+ argument will be used as the random number generator:
# a.shuffle!(random: Random.new(1)) #=> [1, 3, 2]
def shuffle!(random: Random)
Primitive.rb_ary_shuffle_bang(random)
end
# call-seq:
# array.shuffle(random: Random) -> new_ary
#
# Returns a new array with elements of +self+ shuffled.
# a = [1, 2, 3] #=> [1, 2, 3]
# a.shuffle #=> [2, 3, 1]
# a #=> [1, 2, 3]
#
# The optional +random+ argument will be used as the random number generator:
# a.shuffle(random: Random.new(1)) #=> [1, 3, 2]
def shuffle(random: Random)
Primitive.rb_ary_shuffle(random)
end
# call-seq:
# array.sample(random: Random) -> object
# array.sample(n, random: Random) -> new_ary
#
# Returns random elements from +self+.
#
# When no arguments are given, returns a random element from +self+:
# a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# a.sample # => 3
# a.sample # => 8
# If +self+ is empty, returns +nil+.
#
# When argument +n+ is given, returns a new \Array containing +n+ random
# elements from +self+:
# a.sample(3) # => [8, 9, 2]
# a.sample(6) # => [9, 6, 10, 3, 1, 4]
# Returns no more than <tt>a.size</tt> elements
# (because no new duplicates are introduced):
# a.sample(a.size * 2) # => [6, 4, 1, 8, 5, 9, 10, 2, 3, 7]
# But +self+ may contain duplicates:
# a = [1, 1, 1, 2, 2, 3]
# a.sample(a.size * 2) # => [1, 1, 3, 2, 1, 2]
# The argument +n+ must be a non-negative numeric value.
# The order of the result array is unrelated to the order of +self+.
# Returns a new empty \Array if +self+ is empty.
#
# The optional +random+ argument will be used as the random number generator:
# a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# a.sample(random: Random.new(1)) #=> 6
# a.sample(4, random: Random.new(1)) #=> [6, 10, 9, 2]
def sample(n = (ary = false), random: Random)
if Primitive.mandatory_only?
# Primitive.cexpr! %{ rb_ary_sample(self, rb_cRandom, Qfalse, Qfalse) }
Primitive.ary_sample0
else
# Primitive.cexpr! %{ rb_ary_sample(self, random, n, ary) }
Primitive.ary_sample(random, n, ary)
end
end
# call-seq:
# array.first -> object or nil
# array.first(n) -> new_array
#
# Returns elements from +self+; does not modify +self+.
#
# When no argument is given, returns the first element:
#
# a = [:foo, 'bar', 2]
# a.first # => :foo
# a # => [:foo, "bar", 2]
#
# If +self+ is empty, returns +nil+.
#
# When non-negative \Integer argument +n+ is given,
# returns the first +n+ elements in a new \Array:
#
# a = [:foo, 'bar', 2]
# a.first(2) # => [:foo, "bar"]
#
# If <tt>n >= array.size</tt>, returns all elements:
#
# a = [:foo, 'bar', 2]
# a.first(50) # => [:foo, "bar", 2]
#
# If <tt>n == 0</tt> returns an new empty \Array:
#
# a = [:foo, 'bar', 2]
# a.first(0) # []
#
# Related: #last.
def first n = unspecified = true
if Primitive.mandatory_only?
Primitive.attr! :leaf
Primitive.cexpr! %q{ ary_first(self) }
else
if unspecified
Primitive.cexpr! %q{ ary_first(self) }
else
Primitive.cexpr! %q{ ary_take_first_or_last_n(self, NUM2LONG(n), ARY_TAKE_FIRST) }
end
end
end
# call-seq:
# array.last -> object or nil
# array.last(n) -> new_array
#
# Returns elements from +self+; +self+ is not modified.
#
# When no argument is given, returns the last element:
#
# a = [:foo, 'bar', 2]
# a.last # => 2
# a # => [:foo, "bar", 2]
#
# If +self+ is empty, returns +nil+.
#
# When non-negative \Integer argument +n+ is given,
# returns the last +n+ elements in a new \Array:
#
# a = [:foo, 'bar', 2]
# a.last(2) # => ["bar", 2]
#
# If <tt>n >= array.size</tt>, returns all elements:
#
# a = [:foo, 'bar', 2]
# a.last(50) # => [:foo, "bar", 2]
#
# If <tt>n == 0</tt>, returns an new empty \Array:
#
# a = [:foo, 'bar', 2]
# a.last(0) # []
#
# Related: #first.
def last n = unspecified = true
if Primitive.mandatory_only?
Primitive.attr! :leaf
Primitive.cexpr! %q{ ary_last(self) }
else
if unspecified
Primitive.cexpr! %q{ ary_last(self) }
else
Primitive.cexpr! %q{ ary_take_first_or_last_n(self, NUM2LONG(n), ARY_TAKE_LAST) }
end
end
end
end
|