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
|
require 'benchmark'
class Hash
def slice1(*keep_keys)
h = {}
keep_keys.each do |key|
h[key] = fetch(key)
end
h
end
def except1(*less_keys)
slice1(*keys - less_keys)
end
def slice2(*keys)
Hash[select {|k,v| keys.include? k}]
end
def except2(*keys)
reject {|k,v| keys.include? k}
end
end
#
Benchmark.bmbm do |x|
n = 10
a = (0..1000).to_a
h = (0..10000).inject({}){|h, e| h[e] = e ; h}
# slice
x.report("slice1") do
n.times do
h.slice1(*a)
end
end
#x.report("slice2") do
# n.times do
# h.slice2(*a)
# end
#end
# except
x.report("except1") do
n.times do
h.except1(*a)
end
end
x.report("except2") do
n.times do
h.except2(*a)
end
end
end
|
