API foreachi

From TableLibraryTutorial of lua-users.org.

table.foreachi(table, f) foreachi(table, f)

Apply the function f to the elements of the table passed. On each iteration the function f is passed the index-value pair of that element in the table. This is similar to table.foreach except that index-value pairs are passed, not key-value pairs. If the function f returns a non-nil value the iteration loop terminates.

> t = { 1,2,"three"; pi=3.14159, banana="yellow" } > table.foreachi(t, print) 1 1 2 2 3 three

Note in the example only the indexed elements of the table are displayed. See the TablesTutorial for more information on key-value and index-value pairs.

Also note that foreachi starts at index [1], increments the index by one repeatedly, and stops running as soon as it reaches a nil value. This is an example:

> t = { [0] = "zero", --will not be counted [1] = "one", --will be counted; 1 [2] = "two", --will be counted; 2 [3] = "three", --will be counted; 3 ["four"] = "four", --will not be counted; returns 3 [5] = "five" } --will never be reached > foreachi(t, print) 1 one 2 two 3 three

In the above, it starts at t[1] (not t[0]) and counts to t[3], printing the corresponding values along the way. It then checks t[4], sees it is nil, and stops running. t[5] is never checked - this will not hit every array index in a table, only the consecutive ones from one up until it hits its first blank index.