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JavaScript+Ruby

Array.map

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Array.prototype.map = function(func) {
  var arr = [];
  for(var i = 0, l = this.length; i < l; i++) {
    arr.push( func.call(this, this[i]) );
  }
  return arr;
};
[1,2,3,4].map( function(v) { return v * v * v } );
https://snipt.net/embed/80baf340a435f46fd8973205ec33adcb/
https://snipt.net/raw/80baf340a435f46fd8973205ec33adcb/
80baf340a435f46fd8973205ec33adcb
js+erb
JavaScript+Ruby
8
2016-09-24T12:13:31
True
False
False
/api/public/snipt/17601/
arraymap
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1">1</a> <a href="#L-2">2</a> <a href="#L-3">3</a> <a href="#L-4">4</a> <a href="#L-5">5</a> <a href="#L-6">6</a> <a href="#L-7">7</a> <a href="#L-8">8</a></pre></div></td><td class="code"><div class="highlight"><pre><span id="L-1"><a name="L-1"></a><span class="nb">Array</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">map</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">func</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-2"><a name="L-2"></a> <span class="kd">var</span> <span class="nx">arr</span> <span class="o">=</span> <span class="p">[];</span> </span><span id="L-3"><a name="L-3"></a> <span class="k">for</span><span class="p">(</span><span class="kd">var</span> <span class="nx">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="nx">l</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">length</span><span class="p">;</span> <span class="nx">i</span> <span class="o">&lt;</span> <span class="nx">l</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-4"><a name="L-4"></a> <span class="nx">arr</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span> <span class="nx">func</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="k">this</span><span class="p">[</span><span class="nx">i</span><span class="p">])</span> <span class="p">);</span> </span><span id="L-5"><a name="L-5"></a> <span class="p">}</span> </span><span id="L-6"><a name="L-6"></a> <span class="k">return</span> <span class="nx">arr</span><span class="p">;</span> </span><span id="L-7"><a name="L-7"></a><span class="p">};</span> </span><span id="L-8"><a name="L-8"></a><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">4</span><span class="p">].</span><span class="nx">map</span><span class="p">(</span> <span class="kd">function</span><span class="p">(</span><span class="nx">v</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="nx">v</span> <span class="o">*</span> <span class="nx">v</span> <span class="o">*</span> <span class="nx">v</span> <span class="p">}</span> <span class="p">);</span> </span></pre></div> </td></tr></table>
call, closure, javascript
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