==== SWAP ====
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<callout type="primary" color="" icon="fa fa-book" title="Synopsis">
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Exchange objects in levels 1 and 2
</callout>

<callout color="green" icon="fa fa-indent" title="Stack Diagram">
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^  __Input Stack__  ^^  ^  __Output Stack__  ^^
|  **O<sub>2</sub>**  |  **O<sub>1</sub>**  |  **→**  |  **O<sub>1</sub>**  |  **O<sub>2</sub>**  |
|  //Level 2//  |  //Level 1//  |  //→//  |  //Level 2//  |  //Level 1//  | 

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|**Type**| [[manual:chapter5:basics#commands|Command]]  ||
|**Parallel list processing**| [[manual:chapter5:listproc#group-2commands-that-must-use-dolist-to-parallel-process|Group 2]]  || 
|**Affected by flags**| None  ||
</callout>

<callout color="orangered" icon="fa fa-comment" title="Description">
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The ''SWAP'' command exchanges the first 2 levels of the stack.
</callout>

<callout type="success" icon="true" title="Compatibility">
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This command is fully compatible with userRPL.
</callout>

<callout type="info" icon="true" title="Usage">
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<code>
3:            "This is a string"
2:               { 'X' 'Y' 'Z' }
1:                           1_m
……………………………………………………………………………………
SWAP
</code>
will result in
<code>
3:            "This is a string"
2:                           1_m
1:               { 'X' 'Y' 'Z' }
……………………………………………………………………………………

</code>
</callout>

<callout color="darkgray" icon="fa fa-hand-o-right" title="Related Commands">
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