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


def map := [
  "a" => 1,
  "b" => 2,
  "c" => 3,
]
 
for key => value in map {
  println(`$key $value`)
}
 
for value in map {     # ignore keys
  println(`. $value`)
}
 
for key => _ in map {  # ignore values
  println(`$key .`)
}
 
for key in map.domain() {     # iterate over the set whose values are the keys
  println(`$key .`)
}