Programming in Lua : 4.3.2

This first edition was written for Lua 5.0. While still largely relevant for Lua 5.1, there are some differences.
The second edition targets Lua 5.1 and is available at Amazon and as an e-book.
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Programming in Lua

Part I. The Language Chapter 4. Statements

4.3.2 – while

As usual, Lua first tests the while condition; if the condition is false, then the loop ends; otherwise, Lua executes the body of the loop and repeats the process.

    local i = 1
    while a[i] do
      print(a[i])
      i = i + 1
    end