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If a series that is being traversed by FOREACH, FORALL, or FORSKIP is modified during execution of the traversal, do the modifications apply to the traversal?

April 26, 2017execution foreach modifications modified SERIES Traversal traversed

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If a series that is being traversed by FOREACH, FORALL, or FORSKIP is modified during execution of the traversal, do the modifications apply to the traversal?

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Yes. FOREACH, FORALL and FORSKIP use an updated version of the series argument each iteration through. Example: series: [1 2 3 4 5] foreach item series [ print item remove back tail series ] The above example will print the numbers 1 through 3 and the modified series will be [1 2].