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


 
import tables
 
var t: Table[int,string]
 
t[1] = "one"
t[2] = "two"
t[3] = "three"
t[4] = "four"
 
echo "t has " & $t.len & " elements"
 
echo "has t key 4? " & $t.hasKey(4) 
echo "has t key 5? " & $t.hasKey(5)
 
#iterate keys
echo "key iteration:"
for k in t.keys:
  echo "at[" & $k & "]=" & t[k]
 
#iterate pairs
echo "pair iteration:"
for k,v in t.pairs:
  echo "at[" & $k & "]=" & v
 