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<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>
10:@:num/<span class="Special">raw</span> <span class="Special"><-</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 2 3</span>
10:@:num/<span class="Special">raw</span> <span class="Special"><-</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 2 3</span>
10:@:num/<span class="Special">raw</span> <span class="Special"><-</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
10:@:num/<span class="Special">raw</span> <span class="Special"><-</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 3 2 1</span>
run [
array <span class="Special"><-</span> swap array,<span class="Constant"> 0</span>,<span class="Constant"> 2</span>
10:num/<span class="Special">raw</span> <span class="Special"><-</span> index *array,<span class="Constant"> 0</span>
11:num/<span class="Special">raw</span> <span class="Special"><-</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 2 1</span>
run [
array <span class="Special"><-</span> reverse array
10:@:num/<span class="Special">raw</span> <span class="Special"><-</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 3 2 1</span>
run [
array <span class="Special"><-</span> reverse array
10:@:num/<span class="Special">raw</span> <span class="Special"><-</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>
]
]
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