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<pre id='vimCodeElement'>
<span class="muScenario">scenario</span> array-from-args [
run [
<span class="Constant">local-scope</span>
x:&:@:num<span class="Special"> <- </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 <- </span>copy *x
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">3</span> <span class="Comment"># array length</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span>
<span class="Constant">13</span><span class="Special"> <- </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"> -> </span>result:&:@:_elem [
<span class="Constant">local-scope</span>
capacity:num<span class="Special"> <- </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"> <- </span><span class="Constant">next-ingredient</span>
<span class="muControl">break-unless</span> exists?
capacity<span class="Special"> <- </span>add capacity, <span class="Constant">1</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
result<span class="Special"> <- </span>new <span class="Constant">_elem:type</span>, capacity
<span class="Constant">rewind-ingredients</span>
i:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
<span class="Comment"># while read curr-value</span>
done?:bool<span class="Special"> <- </span>greater-or-equal i, capacity
<span class="muControl">break-if</span> done?
curr-value:_elem, exists?:bool<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
assert exists?, <span class="Constant">[error in rewinding ingredients to new-array]</span>
*result<span class="Special"> <- </span>put-index *result, i, curr-value
i<span class="Special"> <- </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">def</span> fill array:&:@:num<span class="muRecipe"> -> </span>array:&:@:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
loopn:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
length:num<span class="Special"> <- </span>length *array
<span class="Delimiter">{</span>
length?:bool<span class="Special"> <- </span>equal loopn, length
<span class="muControl">break-if</span> length?
object:num, arg-received?:bool<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="muControl">break-unless</span> arg-received?
*array<span class="Special"> <- </span>put-index *array, loopn, object
loopn<span class="Special"> <- </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:&:@:num<span class="Special"> <- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
run [
array<span class="Special"> <- </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 <- </span>copy *array
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">2</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">3</span>
]
]
<span class="muScenario">scenario</span> fill-overwrites-existing-values [
<span class="Constant">local-scope</span>
array:&:@:num<span class="Special"> <- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
*array<span class="Special"> <- </span>put-index *array, <span class="Constant">0</span>, <span class="Constant">4</span>
run [
array<span class="Special"> <- </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 <- </span>copy *array
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">2</span>
<span class="Constant">13</span><span class="Special"> <- </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:&:@:num<span class="Special"> <- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
run [
array<span class="Special"> <- </span>fill array
<span class="Constant">10</span>:@:num/<span class="Special">raw <- </span>copy *array
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">13</span><span class="Special"> <- </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">def</span> swap array:&:@:num, index1:num, index2:num<span class="muRecipe"> -> </span>array:&:@:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
object1:num<span class="Special"> <- </span>index *array, index1
object2:num<span class="Special"> <- </span>index *array, index2
*array<span class="Special"> <- </span>put-index *array, index1, object2
*array<span class="Special"> <- </span>put-index *array, index2, object1
]
<span class="muScenario">scenario</span> swap-works [
<span class="Constant">local-scope</span>
array:&:@:num<span class="Special"> <- </span>new <span class="Constant">number:type</span>, <span class="Constant">4</span>
array<span class="Special"> <- </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"> <- </span>swap array, <span class="Constant">0</span>, <span class="Constant">2</span>
<span class="Constant">10</span>:num/<span class="Special">raw <- </span>index *array, <span class="Constant">0</span>
<span class="Constant">11</span>:num/<span class="Special">raw <- </span>index *array, <span class="Constant">2</span>
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">2</span>
<span class="Constant">11</span><span class="Special"> <- </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:&:@:_elem<span class="muRecipe"> -> </span>array:&:@:_elem [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
start:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
length:num<span class="Special"> <- </span>length *array
end:num<span class="Special"> <- </span>subtract length, <span class="Constant">1</span>
<span class="Delimiter">{</span>
done?:bool<span class="Special"> <- </span>greater-or-equal start, end
<span class="muControl">break-if</span> done?
array<span class="Special"> <- </span>swap array, start, end
start<span class="Special"> <- </span>add start, <span class="Constant">1</span>
end<span class="Special"> <- </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:&:@:num<span class="Special"> <- </span>new <span class="Constant">number:type</span>, <span class="Constant">3</span>
array<span class="Special"> <- </span>fill array, <span class="Constant">3</span> <span class="Constant">2</span> <span class="Constant">1</span>
run [
array<span class="Special"> <- </span>reverse array
<span class="Constant">10</span>:@:num/<span class="Special">raw <- </span>copy *array
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">2</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">3</span>
]
]
<span class="muScenario">scenario</span> reverse-array-even-length [
<span class="Constant">local-scope</span>
array:&:@:num<span class="Special"> <- </span>new <span class="Constant">number:type</span>, <span class="Constant">4</span>
array<span class="Special"> <- </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"> <- </span>reverse array
<span class="Constant">10</span>:@:num/<span class="Special">raw <- </span>copy *array
]
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">4</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">2</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">3</span>
<span class="Constant">14</span><span class="Special"> <- </span><span class="Constant">4</span>
]
]
</pre>
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