manual:chapter6:lists:cmd_addrot [newRPL User Manual]

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==== ADDROT ====
<callout type="primary" color="" icon="fa fa-book" title="Synopsis">
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Add elements to a list, keeping only the last N elements
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<callout color="green" icon="fa fa-indent" title="Stack Diagram">
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^  __Input Stack__  ^^^  ^  __Output Stack__  ^
|  **L<sub>data</sub>**  |  **O<sub>item</sub>**  |  **I<sub>size</sub>**  |  **→**  |  **L<sub>data-upd</sub>**  |
|  //Level 3//  |  //Level 2//  |  //Level 1//  |  //→//  |  //Level 1//  |

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| **Keyword type**  | [[manual:chapter5:basics#commands|Command]]  ||
| **Parallel list processing capabilities**  | [[manual:chapter5:listproc#group-2commands-that-must-use-dolist-to-parallel-process|Group 2]]  | //Commands that must use //''[[manual:chapter6:lists:cmd_cmddolist|DOLIST]]''// to parallel process//  |
| **Affected by flags**  | //None//  ||














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<callout color="orangered" icon="fa fa-comment" title="Description">
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The ''ADDROT'' command adds element to a list just like the command ''[[manual:chapter6:lists:cmd_add|ADD]]'' does, but with a difference: if the list grows larger than **I<sub>size</sub>** elements, the first one gets removed.
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<callout type="danger" icon="true" title="Compatibility">
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''ADDROT'' is specific to **newRPL** and has no direct equivalent in **userRPL**.
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<callout type="info" icon="true" title="Usage">
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**__Input__**
<code>
4:                                      
3:                             { A B C }
2:                                     X
1:                                     3
…………………………………………………………………………………………………………
ADDROT                                  
</code>
\\
**__Output__**
<code>
4:                                      
3:                                      
2:                                      
1:                             { B C X }
…………………………………………………………………………………………………………
                                        
</code>
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