array.cpp

#include <iostream>
#include <z/core.hpp>
 
using z::core::array;
using z::core::join;
 
int main() {
    array<zstring> strings = {"123", "abc", "11", "-400"};
 
    // Convert all the string values to integers.
    // Note that non-numeric strings all go to zero.
    auto numbers = strings.map<int>([](auto item) { return item.integer(); });
 
    // Sum all the numbers
    auto total_sum = numbers.reduce(0, [](auto a, auto b) { return a + b; });
 
    // Sum only the non-negative numbers
    auto nonneg_sum = numbers.filter([](auto item) { return item >= 0; }).reduce(0, [](auto a, auto b) { return a + b; });
 
    // Print output
    ("Number list = ["_zs + join(numbers, ", ") + "]").writeln(std::cout);
    ("Sum of all numbers = "_zs + total_sum).writeln(std::cout);
    ("Sum of non-negative numbers = "_zs + nonneg_sum).writeln(std::cout);
}