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<h1>lambdas_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>// Anonymous Functions (Lambdas) 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="code-content"><pre>describe("Anonymous Functions", fn() {</pre></td>
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<td class="line-num">6</td>
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<td class="code-content"><pre> test("fn() syntax", fn() {</pre></td>
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<td class="line-num">7</td>
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<td class="code-content"><pre> let add = fn(a, b) { return a + b; };</pre></td>
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<td class="line-num">8</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">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></pre></td>
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<td class="line-num">11</td>
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<td class="code-content"><pre> test("lambda with pipe syntax", fn() {</pre></td>
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<td class="line-num">12</td>
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<td class="code-content"><pre> let double = |x| { return x * 2; };</pre></td>
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<td class="line-num">13</td>
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<td class="code-content"><pre> assert_eq(double(5), 10);</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></pre></td>
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<td class="line-num">16</td>
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<td class="code-content"><pre> test("lambda with multiple parameters", fn() {</pre></td>
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<td class="line-num">17</td>
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<td class="code-content"><pre> let sum = |a, b, c| { return a + b + c; };</pre></td>
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<td class="line-num">18</td>
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<td class="code-content"><pre> assert_eq(sum(1, 2, 3), 6);</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></pre></td>
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<td class="line-num">21</td>
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<td class="code-content"><pre> test("lambda as callback", fn() {</pre></td>
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<td class="line-num">22</td>
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<td class="code-content"><pre> fn apply(f, x) {</pre></td>
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<td class="line-num">23</td>
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<td class="code-content"><pre> return f(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> let result = apply(|x| { return x * x; }, 4);</pre></td>
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<td class="line-num">26</td>
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<td class="code-content"><pre> assert_eq(result, 16);</pre></td>
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<td class="line-num">27</td>
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<td class="code-content"><pre> });</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> test("immediately invoked lambda", fn() {</pre></td>
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<td class="line-num">30</td>
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<td class="code-content"><pre> let result = (fn(x) { return x + 1; })(5);</pre></td>
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<td class="line-num">31</td>
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<td class="code-content"><pre> assert_eq(result, 6);</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></pre></td>
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<td class="line-num">35</td>
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<td class="code-content"><pre>describe("Lambdas and this Keyword", fn() {</pre></td>
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<td class="line-num">36</td>
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<td class="code-content"><pre> test("arrow lambda captures this from enclosing scope", fn() {</pre></td>
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<td class="line-num">37</td>
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<td class="code-content"><pre> class Outer {</pre></td>
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<td class="line-num">38</td>
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<td class="code-content"><pre> value: Int = 100;</pre></td>
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<td class="line-num">39</td>
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<td class="code-content"><pre> fn get_closure() {</pre></td>
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<td class="line-num">40</td>
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<td class="code-content"><pre> return |x| this.value + x;</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> }</pre></td>
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<td class="line-num">43</td>
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<td class="code-content"><pre> let o = new Outer();</pre></td>
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<td class="line-num">44</td>
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<td class="code-content"><pre> let closure = o.get_closure();</pre></td>
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<td class="line-num">45</td>
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<td class="code-content"><pre> assert_eq(closure(5), 105);</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></pre></td>
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<td class="line-num">48</td>
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<td class="code-content"><pre> test("fn() {} lambda captures this", fn() {</pre></td>
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<td class="line-num">49</td>
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<td class="code-content"><pre> class Container {</pre></td>
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<td class="line-num">50</td>
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<td class="code-content"><pre> factor: Int = 10;</pre></td>
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<td class="line-num">51</td>
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<td class="code-content"><pre> fn multiplier() {</pre></td>
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<td class="line-num">52</td>
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<td class="code-content"><pre> return fn(x) { return x * this.factor; };</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> }</pre></td>
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<td class="line-num">55</td>
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<td class="code-content"><pre> let c = new Container();</pre></td>
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<td class="line-num">56</td>
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<td class="code-content"><pre> let closure = c.multiplier();</pre></td>
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<td class="line-num">57</td>
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<td class="code-content"><pre> assert_eq(closure(5), 50);</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("nested lambdas with this", fn() {</pre></td>
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<td class="line-num">61</td>
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<td class="code-content"><pre> class Outer {</pre></td>
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<td class="line-num">62</td>
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<td class="code-content"><pre> base: Int = 10;</pre></td>
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<td class="line-num">63</td>
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<td class="code-content"><pre> fn create_nested() {</pre></td>
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<td class="line-num">64</td>
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<td class="code-content"><pre> return fn(y) {</pre></td>
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<td class="line-num">65</td>
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<td class="code-content"><pre> return fn(z) {</pre></td>
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<td class="line-num">66</td>
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<td class="code-content"><pre> return this.base + y + z;</pre></td>
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<td class="line-num">67</td>
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<td class="code-content"><pre> };</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> }</pre></td>
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<td class="line-num">71</td>
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<td class="code-content"><pre> let o = new Outer();</pre></td>
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<td class="line-num">72</td>
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<td class="code-content"><pre> let inner = o.create_nested()(5);</pre></td>
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<td class="line-num">73</td>
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<td class="code-content"><pre> assert_eq(inner(3), 18);</pre></td>
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<td class="line-num">74</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">75</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">76</td>
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<td class="code-content"><pre> test("this in method callback", fn() {</pre></td>
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<td class="line-num">77</td>
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<td class="code-content"><pre> class Processor {</pre></td>
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<td class="line-num">78</td>
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<td class="code-content"><pre> multiplier: Int = 2;</pre></td>
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<td class="line-num">79</td>
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<td class="code-content"><pre> fn process(items: Array) {</pre></td>
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<td class="line-num">80</td>
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<td class="code-content"><pre> return [fn(x) { return x * this.multiplier; }](items);</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> }</pre></td>
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<td class="line-num">83</td>
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<td class="code-content"><pre> let p = new Processor();</pre></td>
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<td class="line-num">84</td>
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<td class="code-content"><pre> let result = p.process([1, 2, 3]);</pre></td>
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<td class="line-num">85</td>
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<td class="code-content"><pre> assert_eq(result[0](), 2);</pre></td>
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<td class="line-num">86</td>
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<td class="code-content"><pre> assert_eq(result[1](), 4);</pre></td>
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<td class="line-num">87</td>
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<td class="code-content"><pre> assert_eq(result[2](), 6);</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>});</pre></td>
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<td class="line-num">90</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">91</td>
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<td class="code-content"><pre>describe("Lambda Edge Cases", fn() {</pre></td>
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<td class="line-num">92</td>
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<td class="code-content"><pre> test("lambda with no parameters", fn() {</pre></td>
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<td class="line-num">93</td>
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<td class="code-content"><pre> let getFive = fn() { return 5; };</pre></td>
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<td class="line-num">94</td>
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<td class="code-content"><pre> assert_eq(getFive(), 5);</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></pre></td>
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<td class="line-num">97</td>
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<td class="code-content"><pre> test("lambda with typed parameters", fn() {</pre></td>
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<td class="line-num">98</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let add = fn(a: Int, b: Int) { return a + b; };</pre></td>
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<td class="line-num">99</td>
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<td class="code-content"><pre> assert_eq(add(10, 20), 30);</pre></td>
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<td class="line-num">100</td>
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<td class="code-content"><pre> });</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> test("lambda with typed return", fn() {</pre></td>
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<td class="line-num">103</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let square = fn(x: Int) -> Int { return x * x; };</pre></td>
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<td class="line-num">104</td>
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<td class="code-content"><pre> assert_eq(square(7), 49);</pre></td>
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<td class="line-num">105</td>
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<td class="code-content"><pre> });</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> test("lambda stored in array", fn() {</pre></td>
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<td class="line-num">108</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let ops = [</pre></td>
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<td class="line-num">109</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> fn(x) { return x + 1; },</pre></td>
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<td class="line-num">110</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> fn(x) { return x * 2; }</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> assert_eq(ops[0](5), 6);</pre></td>
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<td class="line-num">113</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(ops[1](5), 10);</pre></td>
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<td class="line-num">114</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">115</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">116</td>
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<td class="code-content"><pre> test("lambda stored in hash", fn() {</pre></td>
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<td class="line-num">117</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let funcs = {</pre></td>
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<td class="line-num">118</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> "double" => fn(x) { return x * 2; },</pre></td>
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<td class="line-num">119</td>
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<td class="code-content"><pre> "triple" => fn(x) { return x * 3; }</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> assert_eq(funcs["double"](5), 10);</pre></td>
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<td class="line-num">122</td>
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<td class="code-content"><pre> assert_eq(funcs["triple"](5), 15);</pre></td>
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<td class="line-num">123</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">124</td>
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<td class="code-content"><pre>});</pre></td>
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