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class Array
def inject(n)
each { |value| n = yield(n, value) }
n
end
def sum
inject(0) { |n, value| n + value }
end
def product
inject(1) { |n, value| n * value }
end
def find
for i in 0...size
value = self[i]
return value if yield(value)
end
return nil
end
end
[ 1, 2, 3, 4, 5 ].sum # 15
[ 1, 2, 3, 4, 5 ].product # 120
[ 1, 2, 3, 4, 5 ].find {|v| v*v > 10 } # 4
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C++´úÂë
#include <array>
#include <functional>
//#include <numeric>
#include <algorithm>
#include <boost/assign.hpp>
#include <iostream>
using namespace std;
template<typename T>
struct Array : public vector<T>
{
template<typename _Iter>
Array(_Iter _First, _Iter _Last) : vector(_First, _Last) {}
T inject(T n, function<T(T,T)> f) const {
for_each(begin(), end(), [&](T value){n = f(n, value);});
return n;
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