API foreach

Apply the function f to the elements of the table passed. On each iteration the function f is passed the key-value pair of that element in the table.
 table.foreach(tab, func);
 foreach(tab, func);
From TableLibraryTutorial of lua-users.org.
 > table.foreach({1,"two",3}, print) -- print the key-value pairs
 1 1
 2 two
 3 3
 > table.foreach({1,"two",3,"four"}, function(k,v) print(string.rep(v,k)) end)
 1
 twotwo
 333
 fourfourfourfour
If the function f returns a non-nil value the iteration loop terminates.
 > table.foreach({1,"two",3}, function(k,v) print(k,v) return k<2 and nil end)
 1 1
 2 two
Tables can contain mixed key-value and index-value elements. table.foreach() will display all of the elements in a table. To only display the index-value elements see table.foreachi(). For more information about this subject see the TablesTutorial.
 > t = { 1,2,"three"; pi=3.14159, banana="yellow" }
 > table.foreach(t, print)
 1 1
 2 2
 3 three
 pi 3.14159
 banana yellow