Show how to iterate over the key-value pairs of an associative array, and print each pair out.

Also show how to iterate just over the keys, or the values, if there is a separate way to do that in your language.



See also

 Array
 Associative array: Creation, Iteration
 Collections
 Compound data type
 Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
 Linked list
 Queue: Definition, Usage
 Set
 Singly-linked list: Element definition, Element insertion, List Traversal, Element Removal
 Stack


var A = [ "H2O" => "water", "NaCl" => "salt", "O2" => "oxygen" ];
 
for k in A.domain do
    writeln("have key: ", k);
 
for v in A do
    writeln("have value: ", v);
 
for (k,v) in zip(A.domain, A) do
    writeln("have element: ", k, " -> ", v);