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 hash = Hash.new(
    key1 => 'value1',
    key2 => 'value2',
)
 
# Iterate over key-value pairs
hash.each { |key, value|
    say "#{key}: #{value}";
}
 
# Iterate only over keys
hash.keys.each { |key|
    say key;
}
 
# Iterate only over values
hash.values.each { |value|
    say value;
}