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bsa7/inject.rb

Created June 10, 2014 02:42
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Ruby inject
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inject.rb
n=10
(1..n).inject(:*) || 1
## 1 ######### 2 #### 3
#1. this is a enum object
#2. Do an operation (*) with accumulated result and next element - 1..3: res = 1 * 2 * 3
#3. this is a foolprof - if an enum object is nil, result alway be the 1
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