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* 3726Kartik K. Agaram2016-12-301-0/+1
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<title>Mu - 073array.mu</title>
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<pre id='vimCodeElement'>
<span class="muScenario">scenario</span> array-from-args [
  run [
    <span class="Constant">1</span>:address:array:character<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">2</span>:array:character<span class="Special"> &lt;- </span>copy *<span class="Constant">1</span>:address:array:character
  ]
  memory-should-contain [
    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">3</span>  <span class="Comment"># array length</span>
    <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
    <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
    <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">2</span>
  ]
]

<span class="Comment"># create an array out of a list of scalar args</span>
<span class="muRecipe">def</span> new-array<span class="muRecipe"> -&gt; </span>result:address:array:character [
  <span class="Constant">local-scope</span>
  capacity:number<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:character, exists?:boolean<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">character:type</span>, capacity
  <span class="Constant">rewind-ingredients</span>
  i:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    <span class="Comment"># while read curr-value</span>
    done?:boolean<span class="Special"> &lt;- </span>greater-or-equal i, capacity
    <span class="muControl">break-if</span> done?
    curr-value:character, exists?:boolean<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
]
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