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Higher-order Functions
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Assembly
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<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_4_7_label" aria-expanded="false">
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Assembly
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Intel
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RISC-V
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<li class="md-nav__item md-nav__item--section md-nav__item--nested">
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<h1 id="kotlin">Kotlin</h1>
|
|
<h2 id="package-imports">Package & Imports</h2>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-0-3">3</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="k">package</span><span class="w"> </span><span class="nn">com.app.uniqueID</span>
|
|
<a id="__codelineno-0-2" name="__codelineno-0-2"></a>
|
|
<a id="__codelineno-0-3" name="__codelineno-0-3"></a><span class="k">import</span><span class="w"> </span><span class="nn"><package></span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="variable-constants">Variable & Constants</h2>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-1-4">4</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1"></a><span class="kd">var</span><span class="w"> </span><span class="nv">variable</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="c1">//variable declaration</span>
|
|
<a id="__codelineno-1-2" name="__codelineno-1-2"></a><span class="kd">var</span><span class="w"> </span><span class="nv">variable</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="c1">//type can be omitted if it can be deduced by initialization</span>
|
|
<a id="__codelineno-1-3" name="__codelineno-1-3"></a>
|
|
<a id="__codelineno-1-4" name="__codelineno-1-4"></a><span class="kd">val</span><span class="w"> </span><span class="nv">CONSTANT_NAME</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="c1">//constant declaration</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="nullable-variables">Nullable Variables</h3>
|
|
<p>For a variable to hold a null value, it must be of a nullable type.<br />
|
|
Nullable types are specified suffixing <code>?</code> to the variable type.</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-2-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-5">5</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-6">6</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1"></a><span class="kd">var</span><span class="w"> </span><span class="nv">nullableVariable</span><span class="p">:</span><span class="w"> </span><span class="n">Type? </span><span class="o">=</span><span class="w"> </span><span class="kc">null</span>
|
|
<a id="__codelineno-2-2" name="__codelineno-2-2"></a>
|
|
<a id="__codelineno-2-3" name="__codelineno-2-3"></a><span class="n">nullableVariable</span><span class="o">?.</span><span class="na">method</span><span class="p">()</span><span class="w"> </span><span class="c1">//correct way to use</span>
|
|
<a id="__codelineno-2-4" name="__codelineno-2-4"></a><span class="c1">//if var is null don't execute method() and return null</span>
|
|
<a id="__codelineno-2-5" name="__codelineno-2-5"></a>
|
|
<a id="__codelineno-2-6" name="__codelineno-2-6"></a><span class="n">nullablevariavle</span><span class="o">!!</span><span class="p">.</span><span class="na">method</span><span class="p">()</span><span class="w"> </span><span class="c1">//unsafe way</span>
|
|
<a id="__codelineno-2-7" name="__codelineno-2-7"></a><span class="c1">//!! -> ignore that var can be null</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="decision-statements">Decision Statements</h2>
|
|
<h3 id="if-else-if-else"><code>If</code> - <code>Else If</code> - <code>Else</code></h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-3-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-5">5</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-6">6</a></span>
|
|
<span class="normal"><a href="#__codelineno-3-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1"></a><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">condition</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-3-2" name="__codelineno-3-2"></a><span class="w"> </span><span class="c1">//code here</span>
|
|
<a id="__codelineno-3-3" name="__codelineno-3-3"></a><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">condition</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-3-4" name="__codelineno-3-4"></a><span class="w"> </span><span class="c1">//code here</span>
|
|
<a id="__codelineno-3-5" name="__codelineno-3-5"></a><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-3-6" name="__codelineno-3-6"></a><span class="w"> </span><span class="c1">//code here</span>
|
|
<a id="__codelineno-3-7" name="__codelineno-3-7"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="conditional-expressions">Conditional Expressions</h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-4-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-5">5</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-6">6</a></span>
|
|
<span class="normal"><a href="#__codelineno-4-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1"></a><span class="kd">var</span><span class="w"> </span><span class="nv">variable</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">condition</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-4-2" name="__codelineno-4-2"></a><span class="w"> </span><span class="c1">//value to be assigned here</span>
|
|
<a id="__codelineno-4-3" name="__codelineno-4-3"></a><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">condition</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-4-4" name="__codelineno-4-4"></a><span class="w"> </span><span class="c1">//value to be assigned here</span>
|
|
<a id="__codelineno-4-5" name="__codelineno-4-5"></a><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-4-6" name="__codelineno-4-6"></a><span class="w"> </span><span class="c1">//value to be assigned here</span>
|
|
<a id="__codelineno-4-7" name="__codelineno-4-7"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="when-expression"><code>When</code> Expression</h3>
|
|
<p>Each branch in a <code>when</code> expression is represented by a condition, an arrow (<code>-></code>), and a result.<br />
|
|
If the condition on the left-hand side of the arrow evaluates to true, then the result of the expression on the right-hand side is returned.<br />
|
|
Note that execution does not fall through from one branch to the next.</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-5-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-14">14</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-15">15</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-16">16</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-17">17</a></span>
|
|
<span class="normal"><a href="#__codelineno-5-18">18</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1"></a><span class="k">when</span><span class="w"> </span><span class="p">(</span><span class="n">variable</span><span class="p">){</span>
|
|
<a id="__codelineno-5-2" name="__codelineno-5-2"></a><span class="w"> </span><span class="n">condition</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-3" name="__codelineno-5-3"></a><span class="w"> </span><span class="n">condition</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-4" name="__codelineno-5-4"></a><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-5" name="__codelineno-5-5"></a><span class="p">}</span>
|
|
<a id="__codelineno-5-6" name="__codelineno-5-6"></a>
|
|
<a id="__codelineno-5-7" name="__codelineno-5-7"></a><span class="c1">//Smart casting</span>
|
|
<a id="__codelineno-5-8" name="__codelineno-5-8"></a><span class="k">when</span><span class="w"> </span><span class="p">(</span><span class="n">variable</span><span class="p">){</span>
|
|
<a id="__codelineno-5-9" name="__codelineno-5-9"></a><span class="w"> </span><span class="k">is</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-10" name="__codelineno-5-10"></a><span class="w"> </span><span class="k">is</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-11" name="__codelineno-5-11"></a><span class="p">}</span>
|
|
<a id="__codelineno-5-12" name="__codelineno-5-12"></a>
|
|
<a id="__codelineno-5-13" name="__codelineno-5-13"></a><span class="c1">//instead of chain of if-else</span>
|
|
<a id="__codelineno-5-14" name="__codelineno-5-14"></a><span class="k">when</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-5-15" name="__codelineno-5-15"></a><span class="w"> </span><span class="n">condition</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-16" name="__codelineno-5-16"></a><span class="w"> </span><span class="n">condition</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-17" name="__codelineno-5-17"></a><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">value</span>
|
|
<a id="__codelineno-5-18" name="__codelineno-5-18"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="loops">Loops</h2>
|
|
<h3 id="for-loop"><code>For</code> Loop</h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-6-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-5">5</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-6">6</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-7">7</a></span>
|
|
<span class="normal"><a href="#__codelineno-6-8">8</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1"></a><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">item</span><span class="w"> </span><span class="k">in</span><span class="w"> </span><span class="n">iterable</span><span class="p">){</span>
|
|
<a id="__codelineno-6-2" name="__codelineno-6-2"></a><span class="w"> </span><span class="c1">//code here</span>
|
|
<a id="__codelineno-6-3" name="__codelineno-6-3"></a><span class="p">}</span>
|
|
<a id="__codelineno-6-4" name="__codelineno-6-4"></a>
|
|
<a id="__codelineno-6-5" name="__codelineno-6-5"></a><span class="c1">//loop in a numerical range</span>
|
|
<a id="__codelineno-6-6" name="__codelineno-6-6"></a><span class="k">for</span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="k">in</span><span class="w"> </span><span class="n">start</span><span class="p">..</span><span class="na">end</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-6-7" name="__codelineno-6-7"></a><span class="w"> </span><span class="c1">//code here</span>
|
|
<a id="__codelineno-6-8" name="__codelineno-6-8"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="functions">Functions</h2>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-7-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-7-5">5</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1"></a><span class="kd">fun</span><span class="w"> </span><span class="nf">functionName</span><span class="p">(</span><span class="n">parameter</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="p">):</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-7-2" name="__codelineno-7-2"></a><span class="w"> </span><span class="c1">//code here</span>
|
|
<a id="__codelineno-7-3" name="__codelineno-7-3"></a>
|
|
<a id="__codelineno-7-4" name="__codelineno-7-4"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="o"><</span><span class="n">expression</span><span class="o">></span>
|
|
<a id="__codelineno-7-5" name="__codelineno-7-5"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="simplifying-function-declarations">Simplifying Function Declarations</h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-8-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-8-14">14</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1"></a><span class="kd">fun</span><span class="w"> </span><span class="nf">functionName</span><span class="p">(</span><span class="n">parameter</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="p">):</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-8-2" name="__codelineno-8-2"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">condition</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-8-3" name="__codelineno-8-3"></a><span class="w"> </span><span class="c1">//returned value</span>
|
|
<a id="__codelineno-8-4" name="__codelineno-8-4"></a><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-8-5" name="__codelineno-8-5"></a><span class="w"> </span><span class="c1">//returned value</span>
|
|
<a id="__codelineno-8-6" name="__codelineno-8-6"></a><span class="w"> </span><span class="p">}</span>
|
|
<a id="__codelineno-8-7" name="__codelineno-8-7"></a><span class="p">}</span>
|
|
<a id="__codelineno-8-8" name="__codelineno-8-8"></a>
|
|
<a id="__codelineno-8-9" name="__codelineno-8-9"></a><span class="kd">fun</span><span class="w"> </span><span class="nf">functionName</span><span class="p">(</span><span class="n">parameter</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="p">):</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">condition</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-8-10" name="__codelineno-8-10"></a><span class="w"> </span><span class="c1">//returned value</span>
|
|
<a id="__codelineno-8-11" name="__codelineno-8-11"></a><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-8-12" name="__codelineno-8-12"></a><span class="w"> </span><span class="c1">//returned value</span>
|
|
<a id="__codelineno-8-13" name="__codelineno-8-13"></a><span class="w"> </span><span class="p">}</span>
|
|
<a id="__codelineno-8-14" name="__codelineno-8-14"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="anonymous-functions">Anonymous Functions</h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-9-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-9-5">5</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">anonymousFunction</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">Type</span><span class="p">)</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">-></span>
|
|
<a id="__codelineno-9-2" name="__codelineno-9-2"></a><span class="w"> </span><span class="c1">//code acting on input here</span>
|
|
<a id="__codelineno-9-3" name="__codelineno-9-3"></a><span class="p">}</span>
|
|
<a id="__codelineno-9-4" name="__codelineno-9-4"></a>
|
|
<a id="__codelineno-9-5" name="__codelineno-9-5"></a><span class="kd">val</span><span class="w"> </span><span class="nv">variableName</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">anonymousFunction</span><span class="p">(</span><span class="n">input</span><span class="p">)</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="higher-order-functions">Higher-order Functions</h3>
|
|
<p>A function can take another function as an argument. Functions that use other functions as arguments are called <em>higher-order</em> functions.<br />
|
|
This pattern is useful for communicating between components in the same way that you might use a callback interface in Java.</p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-10-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-10-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-10-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-10-4">4</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-10-1" name="__codelineno-10-1"></a><span class="kd">fun</span><span class="w"> </span><span class="nf">functionName</span><span class="p">(</span><span class="n">parameter</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="p">,</span><span class="w"> </span><span class="n">function</span><span class="p">:</span><span class="w"> </span><span class="p">(</span><span class="n">Type</span><span class="p">)</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="n">Type</span><span class="p">):</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-10-2" name="__codelineno-10-2"></a><span class="w"> </span><span class="c1">//invoke function</span>
|
|
<a id="__codelineno-10-3" name="__codelineno-10-3"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">function</span><span class="p">(</span><span class="n">parameter</span><span class="p">)</span>
|
|
<a id="__codelineno-10-4" name="__codelineno-10-4"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="object-oriented-programming">Object Oriented Programming</h2>
|
|
<h3 id="class">Class</h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-11-1"> 1</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-2"> 2</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-3"> 3</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-4"> 4</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-5"> 5</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-6"> 6</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-7"> 7</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-8"> 8</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-9"> 9</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-10">10</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-11">11</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-12">12</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-13">13</a></span>
|
|
<span class="normal"><a href="#__codelineno-11-14">14</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-11-1" name="__codelineno-11-1"></a><span class="c1">//primary constructor</span>
|
|
<a id="__codelineno-11-2" name="__codelineno-11-2"></a><span class="kd">class</span><span class="w"> </span><span class="nc">ClassName</span><span class="p">(</span><span class="kd">private</span><span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="nv">attribute</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-11-3" name="__codelineno-11-3"></a>
|
|
<a id="__codelineno-11-4" name="__codelineno-11-4"></a><span class="p">}</span>
|
|
<a id="__codelineno-11-5" name="__codelineno-11-5"></a>
|
|
<a id="__codelineno-11-6" name="__codelineno-11-6"></a><span class="kd">class</span><span class="w"> </span><span class="nc">ClassName</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-11-7" name="__codelineno-11-7"></a>
|
|
<a id="__codelineno-11-8" name="__codelineno-11-8"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="nv">var1</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span>
|
|
<a id="__codelineno-11-9" name="__codelineno-11-9"></a>
|
|
<a id="__codelineno-11-10" name="__codelineno-11-10"></a><span class="w"> </span><span class="c1">//secondary constructor</span>
|
|
<a id="__codelineno-11-11" name="__codelineno-11-11"></a><span class="w"> </span><span class="k">constructor</span><span class="p">(</span><span class="n">parameter</span><span class="p">:</span><span class="w"> </span><span class="n">Type</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-11-12" name="__codelineno-11-12"></a><span class="w"> </span><span class="k">this</span><span class="p">.</span><span class="na">var1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">parameter</span>
|
|
<a id="__codelineno-11-13" name="__codelineno-11-13"></a><span class="w"> </span><span class="p">}</span>
|
|
<a id="__codelineno-11-14" name="__codelineno-11-14"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h3 id="companion-object">Companion Object</h3>
|
|
<p><a href="https://kotlinlang.org/docs/tutorials/kotlin-for-py/objects-and-companion-objects.html">Companion Object Docs</a></p>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-12-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-12-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-12-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-12-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-12-5">5</a></span>
|
|
<span class="normal"><a href="#__codelineno-12-6">6</a></span>
|
|
<span class="normal"><a href="#__codelineno-12-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-12-1" name="__codelineno-12-1"></a><span class="kd">class</span><span class="w"> </span><span class="nc">ClassName</span><span class="w"> </span><span class="p">{</span>
|
|
<a id="__codelineno-12-2" name="__codelineno-12-2"></a>
|
|
<a id="__codelineno-12-3" name="__codelineno-12-3"></a><span class="w"> </span><span class="c1">// in java: static</span>
|
|
<a id="__codelineno-12-4" name="__codelineno-12-4"></a><span class="w"> </span><span class="kd">companion</span><span class="w"> </span><span class="kd">object</span><span class="w"> </span><span class="err">{</span>
|
|
<a id="__codelineno-12-5" name="__codelineno-12-5"></a><span class="w"> </span><span class="c1">// static components of the class</span>
|
|
<a id="__codelineno-12-6" name="__codelineno-12-6"></a><span class="w"> </span><span class="p">}</span>
|
|
<a id="__codelineno-12-7" name="__codelineno-12-7"></a><span class="p">}</span>
|
|
</code></pre></div></td></tr></table></div>
|
|
<h2 id="collections">Collections</h2>
|
|
<h3 id="arraylist">ArrayList</h3>
|
|
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Kotlin</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-13-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-13-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-13-3">3</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-13-1" name="__codelineno-13-1"></a><span class="kd">var</span><span class="w"> </span><span class="nv">array</span><span class="p">:</span><span class="n">ArrayList</span><span class="o"><</span><span class="n">Type</span><span class="o">>?</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">null</span><span class="w"> </span><span class="c1">// List init</span>
|
|
<a id="__codelineno-13-2" name="__codelineno-13-2"></a>
|
|
<a id="__codelineno-13-3" name="__codelineno-13-3"></a><span class="n">array</span><span class="p">.</span><span class="na">add</span><span class="p">(</span><span class="n">item</span><span class="p">)</span><span class="w"> </span><span class="c1">//add item to list</span>
|
|
</code></pre></div></td></tr></table></div>
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