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<h1>functions_spec.sl</h1>
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<td class="line-num">1</td>
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<td class="code-content"><pre>// ============================================================================</pre></td>
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<td class="code-content"><pre>// Functions Test Suite</pre></td>
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<td class="code-content"><pre>// ============================================================================</pre></td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">5</td>
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<td class="code-content"><pre>describe("Functions", fn() {</pre></td>
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<td class="line-num">6</td>
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<td class="code-content"><pre> test("function declaration and call", fn() {</pre></td>
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<td class="line-num">7</td>
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<td class="code-content"><pre> fn add(a, b) {</pre></td>
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<td class="line-num">8</td>
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<td class="code-content"><pre> return a + b;</pre></td>
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<td class="line-num">9</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">10</td>
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<td class="code-content"><pre> assert_eq(add(2, 3), 5);</pre></td>
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<td class="line-num">11</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">12</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">13</td>
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<td class="code-content"><pre> test("function with no parameters", fn() {</pre></td>
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<td class="line-num">14</td>
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<td class="code-content"><pre> fn greet() {</pre></td>
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<td class="line-num">15</td>
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<td class="code-content"><pre> return "hello";</pre></td>
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<td class="line-num">16</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">17</td>
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<td class="code-content"><pre> assert_eq(greet(), "hello");</pre></td>
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<td class="line-num">18</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">19</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">20</td>
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<td class="code-content"><pre> test("function with typed parameters", fn() {</pre></td>
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<td class="line-num">21</td>
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<td class="code-content"><pre> fn multiply(a: Int, b: Int) {</pre></td>
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<td class="line-num">22</td>
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<td class="code-content"><pre> return a * b;</pre></td>
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<td class="line-num">23</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">24</td>
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<td class="code-content"><pre> assert_eq(multiply(3, 4), 12);</pre></td>
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<td class="line-num">25</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">26</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">27</td>
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<td class="code-content"><pre> test("function with return type", fn() {</pre></td>
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<td class="line-num">28</td>
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<td class="code-content"><pre> fn square(x: Int) -> Int {</pre></td>
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<td class="line-num">29</td>
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<td class="code-content"><pre> return x * x;</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> assert_eq(square(5), 25);</pre></td>
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<td class="line-num">32</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">33</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">34</td>
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<td class="code-content"><pre> test("function with default parameter", fn() {</pre></td>
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<td class="line-num">35</td>
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<td class="code-content"><pre> fn greet(name: String = "World") {</pre></td>
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<td class="line-num">36</td>
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<td class="code-content"><pre> return "Hello " + name;</pre></td>
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<td class="line-num">37</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">38</td>
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<td class="code-content"><pre> assert_eq(greet(), "Hello World");</pre></td>
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<td class="line-num">39</td>
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<td class="code-content"><pre> assert_eq(greet("Alice"), "Hello Alice");</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></pre></td>
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<td class="line-num">42</td>
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<td class="code-content"><pre> test("function returning null implicitly", fn() {</pre></td>
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<td class="line-num">43</td>
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<td class="code-content"><pre> fn nothing() {</pre></td>
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<td class="line-num">44</td>
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<td class="code-content"><pre> let x = 1;</pre></td>
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<td class="line-num">45</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">46</td>
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<td class="code-content"><pre> assert_null(nothing());</pre></td>
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<td class="line-num">47</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">48</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">49</td>
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<td class="code-content"><pre> test("early return", fn() {</pre></td>
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<td class="line-num">50</td>
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<td class="code-content"><pre> fn check(x) {</pre></td>
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<td class="line-num">51</td>
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<td class="code-content"><pre> if (x < 0) {</pre></td>
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<td class="line-num">52</td>
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<td class="code-content"><pre> return "negative";</pre></td>
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<td class="line-num">53</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">54</td>
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<td class="code-content"><pre> return "non-negative";</pre></td>
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<td class="line-num">55</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">56</td>
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<td class="code-content"><pre> assert_eq(check(-5), "negative");</pre></td>
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<td class="line-num">57</td>
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<td class="code-content"><pre> assert_eq(check(5), "non-negative");</pre></td>
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<td class="line-num">58</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">59</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">60</td>
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<td class="code-content"><pre> test("recursive function", fn() {</pre></td>
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<td class="line-num">61</td>
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<td class="code-content"><pre> fn factorial(n) {</pre></td>
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<td class="line-num">62</td>
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<td class="code-content"><pre> if (n <= 1) {</pre></td>
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<td class="line-num">63</td>
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<td class="code-content"><pre> return 1;</pre></td>
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<td class="line-num">64</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">65</td>
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<td class="code-content"><pre> return n * factorial(n - 1);</pre></td>
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<td class="line-num">66</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">67</td>
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<td class="code-content"><pre> assert_eq(factorial(5), 120);</pre></td>
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<td class="line-num">68</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">69</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">70</td>
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<td class="code-content"><pre> test("function as first-class value", fn() {</pre></td>
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<td class="line-num">71</td>
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<td class="code-content"><pre> fn double(x) {</pre></td>
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<td class="line-num">72</td>
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<td class="code-content"><pre> return x * 2;</pre></td>
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<td class="line-num">73</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">74</td>
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<td class="code-content"><pre> let f = double;</pre></td>
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<td class="line-num">75</td>
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<td class="code-content"><pre> assert_eq(f(5), 10);</pre></td>
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<td class="line-num">76</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">77</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">78</td>
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<td class="code-content"><pre> test("higher-order function", fn() {</pre></td>
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<td class="line-num">79</td>
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<td class="code-content"><pre> fn apply(f, x) {</pre></td>
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<td class="line-num">80</td>
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<td class="code-content"><pre> return f(x);</pre></td>
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<td class="line-num">81</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">82</td>
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<td class="code-content"><pre> fn triple(x) {</pre></td>
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<td class="line-num">83</td>
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<td class="code-content"><pre> return x * 3;</pre></td>
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<td class="line-num">84</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">85</td>
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<td class="code-content"><pre> assert_eq(apply(triple, 4), 12);</pre></td>
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<td class="line-num">86</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">87</td>
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<td class="code-content"><pre>});</pre></td>
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<td class="line-num">88</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">89</td>
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<td class="code-content"><pre>describe("Closures", fn() {</pre></td>
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<td class="line-num">90</td>
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<td class="code-content"><pre> test("closure captures outer variable", fn() {</pre></td>
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<td class="line-num">91</td>
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<td class="code-content"><pre> let multiplier = 3;</pre></td>
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<td class="line-num">92</td>
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<td class="code-content"><pre> let multiply = fn(x) { return x * multiplier; };</pre></td>
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<td class="line-num">93</td>
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<td class="code-content"><pre> assert_eq(multiply(5), 15);</pre></td>
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<td class="line-num">94</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">95</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">96</td>
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<td class="code-content"><pre> test("closure captures multiple variables", fn() {</pre></td>
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<td class="line-num">97</td>
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<td class="code-content"><pre> let a = 10;</pre></td>
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<td class="line-num">98</td>
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<td class="code-content"><pre> let b = 20;</pre></td>
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<td class="line-num">99</td>
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<td class="code-content"><pre> let sum = fn() { return a + b; };</pre></td>
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<td class="line-num">100</td>
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<td class="code-content"><pre> assert_eq(sum(), 30);</pre></td>
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<td class="line-num">101</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">102</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">103</td>
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<td class="code-content"><pre> test("closure factory", fn() {</pre></td>
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<td class="line-num">104</td>
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<td class="code-content"><pre> fn makeAdder(n) {</pre></td>
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<td class="line-num">105</td>
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<td class="code-content"><pre> return fn(x) { return x + n; };</pre></td>
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<td class="line-num">106</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">107</td>
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<td class="code-content"><pre> let add5 = makeAdder(5);</pre></td>
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<td class="line-num">108</td>
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<td class="code-content"><pre> let add10 = makeAdder(10);</pre></td>
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<td class="line-num">109</td>
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<td class="code-content"><pre> assert_eq(add5(3), 8);</pre></td>
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<td class="line-num">110</td>
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<td class="code-content"><pre> assert_eq(add10(3), 13);</pre></td>
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<td class="line-num">111</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">112</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">113</td>
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<td class="code-content"><pre> test("closure maintains separate state", fn() {</pre></td>
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<td class="line-num">114</td>
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<td class="code-content"><pre> fn makeCounter() {</pre></td>
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<td class="line-num">115</td>
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<td class="code-content"><pre> let count = 0;</pre></td>
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<td class="line-num">116</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> return fn() {</pre></td>
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<td class="line-num">117</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> count = count + 1;</pre></td>
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<td class="line-num">118</td>
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<td class="code-content"><pre> return count;</pre></td>
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<td class="line-num">119</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> };</pre></td>
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<td class="line-num">120</td>
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<td class="code-content"><pre> }</pre></td>
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<td class="line-num">121</td>
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<td class="code-content"><pre> let counter1 = makeCounter();</pre></td>
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<td class="line-num">122</td>
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<td class="code-content"><pre> let counter2 = makeCounter();</pre></td>
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<td class="line-num">123</td>
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<td class="code-content"><pre> assert_eq(counter1(), 1);</pre></td>
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<td class="line-num">124</td>
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<td class="code-content"><pre> assert_eq(counter1(), 2);</pre></td>
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<td class="line-num">125</td>
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<td class="code-content"><pre> assert_eq(counter2(), 1);</pre></td>
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<td class="line-num">126</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">127</td>
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<td class="code-content"><pre>});</pre></td>
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