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<h1>iteration_methods.sl</h1>
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<td class="line-num">1</td>
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<td class="code-content"><pre>// Array iteration methods: map, filter, each</pre></td>
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<td class="line-num">2</td>
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<td class="code-content"><pre>// These work similarly to Ruby arrays</pre></td>
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<td class="line-num">3</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">4</td>
<td class="line-indicator">✗</td>
<td class="code-content"><pre>let numbers = [1, 2, 3, 4, 5];</pre></td>
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<td class="line-num">5</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">6</td>
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<td class="code-content"><pre>// map - transforms each element and returns new array</pre></td>
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<td class="line-num">7</td>
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<td class="code-content"><pre>let doubled = numbers.map(fn(x) x * 2);</pre></td>
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<td class="line-num">8</td>
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<td class="code-content"><pre>print("Original:", numbers);</pre></td>
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<td class="line-num">9</td>
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<td class="code-content"><pre>print("Doubled (map x*2):", doubled);</pre></td>
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<td class="line-num">10</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">11</td>
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<td class="code-content"><pre>// filter - selects elements where predicate returns truthy</pre></td>
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<td class="line-num">12</td>
<td class="line-indicator">✗</td>
<td class="code-content"><pre>let evens = numbers.filter(fn(x) x % 2 == 0);</pre></td>
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<td class="line-num">13</td>
<td class="line-indicator">✗</td>
<td class="code-content"><pre>print("Evens (filter x%2==0):", evens);</pre></td>
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<td class="line-num">14</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">15</td>
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<td class="code-content"><pre>// Chaining - map and filter together</pre></td>
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<td class="line-num">16</td>
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<td class="code-content"><pre>let result = numbers</pre></td>
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<td class="line-num">17</td>
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<td class="code-content"><pre> .map(fn(x) x * 2)</pre></td>
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<td class="line-num">18</td>
<td class="line-indicator">✗</td>
<td class="code-content"><pre> .filter(fn(x) x > 5);</pre></td>
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<td class="line-num">19</td>
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<td class="code-content"><pre>print("Doubled then filtered (>5):", result);</pre></td>
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<td class="line-num">20</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">21</td>
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<td class="code-content"><pre>// each - executes function for side effects, returns original array</pre></td>
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<td class="line-num">22</td>
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<td class="code-content"><pre>print("Each iteration:");</pre></td>
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<td class="line-num">23</td>
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<td class="code-content"><pre>numbers.each(fn(x) print(" " + x));</pre></td>
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<td class="line-num">24</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">25</td>
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<td class="code-content"><pre>// Block syntax with explicit return</pre></td>
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<td class="line-num">26</td>
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<td class="code-content"><pre>let squares = numbers.map(fn(n) {</pre></td>
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<td class="line-num">27</td>
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<td class="code-content"><pre> return n * n;</pre></td>
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<td class="line-num">28</td>
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<td class="code-content"><pre>});</pre></td>
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<td class="line-num">29</td>
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<td class="code-content"><pre>print("Squares (block syntax):", squares);</pre></td>
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<td class="line-num">30</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">31</td>
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<td class="code-content"><pre>// Hash iteration methods</pre></td>
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<td class="line-num">32</td>
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<td class="code-content"><pre>let hash = {"name": "Alice", "age": 30, "city": "Paris"};</pre></td>
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<td class="line-num">33</td>
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<td class="code-content"><pre>print("\nOriginal hash:", hash);</pre></td>
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<td class="line-num">34</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">35</td>
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<td class="code-content"><pre>// Hash map - function receives [key, value] array, returns [new_key, new_value]</pre></td>
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<td class="line-num">36</td>
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<td class="code-content"><pre>let prefixed = hash.map(fn(pair) {</pre></td>
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<td class="line-num">37</td>
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<td class="code-content"><pre> return ["prefix_" + pair[0], pair[1]];</pre></td>
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<td class="line-num">38</td>
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<td class="code-content"><pre>});</pre></td>
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<td class="line-num">39</td>
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<td class="code-content"><pre>print("Prefixed keys:", prefixed);</pre></td>
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<td class="line-num">40</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">41</td>
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<td class="code-content"><pre>// Hash filter - function receives [key, value] array, returns boolean</pre></td>
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<td class="line-num">42</td>
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<td class="code-content"><pre>let adults = hash.filter(fn(pair) {</pre></td>
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<td class="line-num">43</td>
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<td class="code-content"><pre> return pair[0] == "age" && pair[1] >= 18;</pre></td>
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<td class="line-num">44</td>
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<td class="code-content"><pre>});</pre></td>
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<td class="line-num">45</td>
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<td class="code-content"><pre>print("Adults filter:", adults);</pre></td>
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<td class="line-num">46</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">47</td>
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<td class="code-content"><pre>// Hash each - function receives [key, value] array</pre></td>
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<td class="line-num">48</td>
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<td class="code-content"><pre>print("Hash each:");</pre></td>
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<td class="line-num">49</td>
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<td class="code-content"><pre>hash.each(fn(pair) {</pre></td>
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<td class="line-num">50</td>
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<td class="code-content"><pre> print(" " + pair[0] + ": " + pair[1]);</pre></td>
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<td class="line-num">51</td>
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<td class="code-content"><pre>});</pre></td>
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<td class="line-num">52</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">53</td>
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<td class="code-content"><pre>print("\nAll iteration tests passed!");</pre></td>
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