<span class="hljs-keyword">var</span> noop = <span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) {};

<span class="hljs-keyword">var</span> identity = <span class="hljs-keyword">function</span>(<span class="hljs-params">foo</span>) {
  <span class="hljs-keyword">return</span> foo;
};

<span class="hljs-keyword">function</span> <span class="hljs-title function_">println</span>(<span class="hljs-params">value: <span class="hljs-built_in">string</span></span>);

<span class="hljs-keyword">function</span> <span class="hljs-title function_">getArray</span>(<span class="hljs-params"></span>): <span class="hljs-built_in">number</span>[] {
  <span class="hljs-keyword">return</span> [<span class="hljs-number">1</span>, <span class="hljs-number">2</span>];
}

<span class="hljs-keyword">type</span> <span class="hljs-title class_">Foo</span> = {
    <span class="hljs-title function_">functionInFoo</span>(): <span class="hljs-built_in">void</span>;
};

<span class="hljs-keyword">const</span> <span class="hljs-title function_">good</span> = (<span class="hljs-params"></span>) =&gt; <span class="hljs-number">0</span>;
<span class="hljs-keyword">const</span> <span class="hljs-title function_">good</span> = (<span class="hljs-params">x</span>) =&gt; <span class="hljs-number">0</span>;
<span class="hljs-keyword">const</span> bad = (<span class="hljs-function"><span class="hljs-params">a</span> =&gt;</span> [...a, b]);
<span class="hljs-keyword">const</span> bad = (<span class="hljs-function"><span class="hljs-params">_</span> =&gt;</span> <span class="hljs-title function_">doSomething</span>());
<span class="hljs-keyword">const</span> bad = (<span class="hljs-function">() =&gt;</span> <span class="hljs-number">0</span>);
<span class="hljs-keyword">const</span> bad = (<span class="hljs-function">(<span class="hljs-params">a, b</span>) =&gt;</span> [...a, b]);
<span class="hljs-keyword">const</span> array = [<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>].<span class="hljs-property">reduce</span>&lt;<span class="hljs-built_in">number</span>[]&gt;(<span class="hljs-function">(<span class="hljs-params">acc, next</span>) =&gt;</span> [...acc, next], []);
<span class="hljs-keyword">const</span> bad = (<span class="hljs-function">(<span class="hljs-params">a=<span class="hljs-number">2</span>, b=<span class="hljs-number">5</span></span>) =&gt;</span> [...a, b]);
sides.<span class="hljs-title function_">every</span>(<span class="hljs-function">(<span class="hljs-params">length,width=(<span class="hljs-number">3</span>+<span class="hljs-number">2</span>+(<span class="hljs-number">4</span>/<span class="hljs-number">5</span>))</span>) =&gt;</span> length &gt; <span class="hljs-number">0</span> );