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If you wire an array to a For Loop or While Loop, you can read and process every element in that array by enabling auto-indexing. When you wire an array from an external node to an input tunnel on the loop border and enable auto-indexing on the input tunnel, elements of that array enter the loop one at a time, starting with the first element. Right-click the tunnel at the loop border and select Enable Indexing or Disable Indexing from the shortcut menu to enable or disable auto-indexing. To avoid default data output values when a loop does not execute, enable auto-indexing every time a For Loop has an output tunnel. Auto-indexing for While Loops is disabled by default.