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<pre id='vimCodeElement'>
<span class="muScenario">scenario</span> array-from-args [
  run [
    <span class="Constant">local-scope</span>
    x:&amp;:@:num<span class="Special"> &lt;- </span>new-array <span class="Constant">0</span>, <span class="Constant">1</span>, <span class="Constant">2</span>
    <span class="Constant">10</span>:@:num/<span class="Special">raw &lt;- </span>copy *x
  ]
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">3</span>  <span class="Comment"># array length</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
    <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
    <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">2</span>
  ]
]

<span class="Comment"># create an array out of a list of args</span>
<span class="muRecipe">def</span> new-array<span class="muRecipe"> -&gt; </span>result:&amp;:@:_elem [
  <span class="Constant">local-scope</span>
  capacity:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Comment"># while read curr-value</span>
    curr-value:_elem, exists?:bool<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
    <span class="muControl">break-unless</span> exists?
    capacity<span class="Special"> &lt;- </span>add capacity, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  result<span class="Special"> &lt;- </span>new <span class="Constant">_elem:type</span>, capacity
  <span class="Constant">rewind-ingredients</span>
  i:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Comment"># while read curr-value</span>
    done?:bool<span class="Special"> &lt;- </span>greater-or-equal i, capacity
    <span class="muControl">break-if</span> done?
    curr-value:_elem, exists?:bool<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
    assert exists?, <span class="Constant">[error in rewinding ingredients to new-array]</span>
    *result<span class="Special"> &lt;- </span>put-index *result, i, curr-value
    i<span class="Special"> &lt;- </span>add i, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  <span class="muControl">return</span> result
]

<span class="Comment"># fill an existing array with a set of numbers</span>
<span class="Comment"># (contributed by Caleb Couch)</span>
<span class="muRecipe">recipe</span> fill array:&amp;:@:num<span class="muRecipe"> -&gt; </span>array:&amp;:@:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  loopn:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  length:num<span class="Special"> &lt;- </span>length *array
  <span class="Delimiter">{</span>
    length?:bool<span class="Special"> &lt;- </span>equal loopn, length
    <span class="muControl">break-if</span> length?
    object:num, arg-received?:bool<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
    <span class="muControl">break-unless</span> arg-received?
    *array<span class="Special"> &lt;- </span>put-index *array, loopn, object
    loopn<span class="Special"> &lt;- </span>add loopn, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muScenario">scenario</span> fill-on-an-empty-array [
  <span class="Constant">local-scope</span>
  array:&amp;:@:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
  run [
    array<span class="Special"> &lt;- </span>fill array, <span class="Constant">1</span> <span class="Constant">2</span> <span class="Constant">3</span>
    <span class="Constant">10</span>:@:num/<span class="Special">raw &lt;- </span>copy *array
  ]
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
    <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">2</span>
    <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
  ]
]

<span class="muScenario">scenario</span> fill-overwrites-existing-values [
  <span class="Constant">local-scope</span>
  array:&amp;:@:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
  *array<span class="Special"> &lt;- </span>put-index *array, <span class="Constant">0</span>, <span class="Constant">4</span>
  run [
    array<span class="Special"> &lt;- </span>fill array, <span class="Constant">1</span> <span class="Constant">2</span> <span class="Constant">3</span>
    <span class="Constant">10</span>:@:num/<span class="Special">raw &lt;- </span>copy *array
  ]
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
    <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">2</span>
    <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
  ]
]

<span class="muScenario">scenario</span> fill-exits-gracefully-when-given-no-ingredients [
  <span class="Constant">local-scope</span>
  array:&amp;:@:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
  run [
    array<span class="Special"> &lt;- </span>fill array
    <span class="Constant">10</span>:@:num/<span class="Special">raw &lt;- </span>copy *array
  ]
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
    <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
    <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
  ]
]

<span class="Comment"># swap two elements of an array</span>
<span class="Comment"># (contributed by Caleb Couch)</span>
<span class="muRecipe">recipe</span> swap array:&amp;:@:num, index1:num, index2:num<span class="muRecipe"> -&gt; </span>array:&amp;:@:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  object1:num<span class="Special"> &lt;- </span>index *array, index1
  object2:num<span class="Special"> &lt;- </span>index *array, index2
  *array<span class="Special"> &lt;- </span>put-index *array, index1, object2
  *array<span class="Special"> &lt;- </span>put-index *array, index2, object1
]

<span class="muScenario">scenario</span> swap-works [
  <span class="Constant">local-scope</span>
  array:&amp;:@:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>, <span class="Constant">4</span>
  array<span class="Special"> &lt;- </span>fill array, <span class="Constant">4</span> <span class="Constant">3</span> <span class="Constant">2</span> <span class="Constant">1</span>
  run [
    array<span class="Special"> &lt;- </span>swap array, <span class="Constant">0</span>, <span class="Constant">2</span>
    <span class="Constant">10</span>:num/<span class="Special">raw &lt;- </span>index *array, <span class="Constant">0</span>
    <span class="Constant">11</span>:num/<span class="Special">raw &lt;- </span>index *array, <span class="Constant">2</span>
  ]
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">2</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">4</span>
  ]
]

<span class="Comment"># reverse the elements of an array</span>
<span class="Comment"># (contributed by Caleb Couch)</span>
<span class="muRecipe">def</span> reverse array:&amp;:@:_elem<span class="muRecipe"> -&gt; </span>array:&amp;:@:_elem [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  start:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  length:num<span class="Special"> &lt;- </span>length *array
  end:num<span class="Special"> &lt;- </span>subtract length, <span class="Constant">1</span>
  <span class="Delimiter">{</span>
    done?:bool<span class="Special"> &lt;- </span>greater-or-equal start, end
    <span class="muControl">break-if</span> done?
    array<span class="Special"> &lt;- </span>swap array, start, end
    start<span class="Special"> &lt;- </span>add start, <span class="Constant">1</span>
    end<span class="Special"> &lt;- </span>subtract end, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muScenario">scenario</span> reverse-array-odd-length [
  <span class="Constant">local-scope</span>
  array:&amp;:@:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
  array<span class="Special"> &lt;- </span>fill array, <span class="Constant">3</span> <span class="Constant">2</span> <span class="Constant">1</span>
  run [
    array<span class="Special"> &lt;- </span>reverse array
    <span class="Constant">10</span>:@:num/<span class="Special">raw &lt;- </span>copy *array
  ]
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
    <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">2</span>
    <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
  ]
]

<span class="muScenario">scenario</span> reverse-array-even-length [
  <span class="Constant">local-scope</span>
  array:&amp;:@:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>, <span class="Constant">4</span>
  array<span class="Special"> &lt;- </span>fill array, <span class="Constant">4</span> <span class="Constant">3</span> <span class="Constant">2</span> <span class="Constant">1</span>
  run [
    array<span class="Special"> &lt;- </span>reverse array
    <span class="Constant">10</span>:@:num/<span class="Special">raw &lt;- </span>copy *array
  ]
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">4</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
    <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">2</span>
    <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">3</span>
    <span class="Constant">14</span><span class="Special"> &lt;- </span><span class="Constant">4</span>
  ]
]
</pre>
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