Solved: 28 - Algorithm Lambdas

modules/08_stl_algorithms/src/algorithm_lambdas.cpp

@@ -1,20 +1,29 @@
 #include "algorithm_lambdas.hpp"
 
+#include <algorithm>
+
 namespace stl_algorithms {
 
 auto filter_length(const std::vector<std::string>& words, std::size_t min_len)
     -> std::vector<std::string> {
-    (void)words; (void)min_len;
-    return {};
+    const auto is_valid = [min_len](const auto& word) { return word.size() >= min_len; };
+    auto r = std::vector<std::string>();
+    std::ranges::copy_if(words,std::back_inserter(r), is_valid);
+    return r;
 }
 
 auto map_to_lengths(const std::vector<std::string>& words) -> std::vector<int> {
-    (void)words;
-    return {};
+    auto r = std::vector<int>();
+    for (const auto& word : words) {
+        r.push_back(static_cast<int>(word.size()));
+    }
+    return r;
 }
 
-auto first_match(const std::vector<int>& data, int threshold) -> int {
-    (void)data; (void)threshold;
+auto first_match(const std::vector<int>& data, const int threshold) -> int {
+    for (const auto& value : data) {
+        if (value >= threshold) return value;
+    }
     return -1;
 }