update

Task/Associative-array-Iteration/Bracmat/associative-array-iteration.bracmat

@@ -0,0 +1,18 @@
+(  new$hash:?myhash
+& (myhash..insert)$(title."Some title")
+& (myhash..insert)$(formula.a+b+x^7)
+& (myhash..insert)$(fruit.apples oranges kiwis)
+& (myhash..insert)$(meat.)
+& (myhash..insert)$(fruit.melons bananas)
+& (myhash..remove)$formula
+& (myhash..insert)$(formula.x^2+y^2)
+&   (myhash..forall)
+  $ (
+    =   key value
+      .     whl
+          ' ( !arg:(?key.?value) ?arg
+            & put$("key:" !key "\nvalue:" !value \n)
+            )
+        & put$\n
+    )
+);

Task/Associative-array-Iteration/C++/associative-array-iteration-1.cpp

@@ -1,12 +1,33 @@
-std::map<std::string, int> myDict;
-myDict["hello"] = 1;
-myDict["world"] = 2;
-myDict["!"] = 3;
+#include <map>
+#include <iostream>
+#include <algorithm>
+#include <vector>
 
-// iterating over key-value pairs:
-for (std::map<std::string, int>::iterator it = myDict.begin(); it != myDict.end(); it++) {
-    // the thing pointed to by the iterator is a pair<std::string, int>
-    std::string key = it->first;
-    int value = it->second;
-    std::cout << "key = " << key << ", value = " << value << std::endl;
+int main() {
+  using MyDict = std::map<std::string, int>;
+
+  MyDict dict = {
+    {"One", 1},
+    {"Two", 2},
+    {"Three", 7}
+  };
+
+  dict["Three"] = 3;
+
+  std::cout << "One: " << dict["One"] << std::endl;
+
+  // Make vector of the keys from our map
+  std::vector<std::string> keys;
+  std::transform(dict.begin(), dict.end(), std::back_inserter(keys),
+    [](MyDict::value_type& kv) { return kv.first; });
+
+  std::cout << "Keys: " << std::endl;
+  for(auto& key: keys) std::cout << "  " << key << std::endl;
+
+  std::cout << "Key/Value pairs: " << std::endl;
+  for(auto& kv: dict) {
+    std::cout << "  " << kv.first << ": " << kv.second << std::endl;
+  }
+
+  return 0;
 }

Task/Associative-array-Iteration/C++/associative-array-iteration-2.cpp

@@ -1,21 +1,12 @@
-#include <map>
-#include <algorithm>
-#include <iostream>
-#include <string>
+std::map<std::string, int> myDict;
+myDict["hello"] = 1;
+myDict["world"] = 2;
+myDict["!"] = 3;
 
-using namespace std;
-
-int main()
-{
-    map<string, int> myDict;
-    myDict["hello"] = 1;
-    myDict["world"] = 2;
-    myDict["!"] = 3;
-
-    for_each(myDict.begin(), myDict.end(),
-        [](const pair<string,int>& p)
-        {
-            cout << "key = " << p.first << ", value = " << p.second << endl;
-        });
-    return 0;
+// iterating over key-value pairs:
+for (std::map<std::string, int>::iterator it = myDict.begin(); it != myDict.end(); it++) {
+    // the thing pointed to by the iterator is a pair<std::string, int>
+    std::string key = it->first;
+    int value = it->second;
+    std::cout << "key = " << key << ", value = " << value << std::endl;
 }