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JavaScript

Array Flattener

(function() {
    var flattened = [];
    var flatten = function (arr,outStr,delimiter){
      for(var i=0; i<arr.length; i++) {
          if(arr[i] instanceof Array) {
              flatten(arr[i],outStr,delimiter);
          } else {
              if(outStr===true) {
                  if(flattened.length <= 0) {
                      flattened += arr[i];
                  } else {
                      flattened += delimiter + arr[i];
                  }
              } else {
                  flattened.push(arr[i]);
              }
          }
      }
        
      return flattened;
        
    }
    
    var input = ['dog','cat','mouse',['banana','orange','apple',[7,4,['hello'],9]]];
    
    flatten(input,true,'|');
})();

Description

Flattens a multidimensional array into a single dimensional array, or implodes array to a string with optional delimiter.
https://snipt.net/embed/8c591538463d63f0b16aebde7b1c80e9/
/raw/8c591538463d63f0b16aebde7b1c80e9/
8c591538463d63f0b16aebde7b1c80e9
js
JavaScript
27
2019-07-19T04:07:18
True
False
False
Feb 20, 2014 at 01:56 PM
/api/public/snipt/115527/
array-flattener
<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> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="p">(</span><span class="kd">function</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">flattened</span> <span class="o">=</span> <span class="p">[];</span> </span><span id="L-3"><a name="L-3"></a> <span class="kd">var</span> <span class="nx">flatten</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">arr</span><span class="p">,</span><span class="nx">outStr</span><span class="p">,</span><span class="nx">delimiter</span><span class="p">){</span> </span><span id="L-4"><a name="L-4"></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">i</span><span class="o">&lt;</span><span class="nx">arr</span><span class="p">.</span><span class="nx">length</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-5"><a name="L-5"></a> <span class="k">if</span><span class="p">(</span><span class="nx">arr</span><span class="p">[</span><span class="nx">i</span><span class="p">]</span> <span class="k">instanceof</span> <span class="nb">Array</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-6"><a name="L-6"></a> <span class="nx">flatten</span><span class="p">(</span><span class="nx">arr</span><span class="p">[</span><span class="nx">i</span><span class="p">],</span><span class="nx">outStr</span><span class="p">,</span><span class="nx">delimiter</span><span class="p">);</span> </span><span id="L-7"><a name="L-7"></a> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span> </span><span id="L-8"><a name="L-8"></a> <span class="k">if</span><span class="p">(</span><span class="nx">outStr</span><span class="o">===</span><span class="kc">true</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-9"><a name="L-9"></a> <span class="k">if</span><span class="p">(</span><span class="nx">flattened</span><span class="p">.</span><span class="nx">length</span> <span class="o">&lt;=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-10"><a name="L-10"></a> <span class="nx">flattened</span> <span class="o">+=</span> <span class="nx">arr</span><span class="p">[</span><span class="nx">i</span><span class="p">];</span> </span><span id="L-11"><a name="L-11"></a> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span> </span><span id="L-12"><a name="L-12"></a> <span class="nx">flattened</span> <span class="o">+=</span> <span class="nx">delimiter</span> <span class="o">+</span> <span class="nx">arr</span><span class="p">[</span><span class="nx">i</span><span class="p">];</span> </span><span id="L-13"><a name="L-13"></a> <span class="p">}</span> </span><span id="L-14"><a name="L-14"></a> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span> </span><span id="L-15"><a name="L-15"></a> <span class="nx">flattened</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">arr</span><span class="p">[</span><span class="nx">i</span><span class="p">]);</span> </span><span id="L-16"><a name="L-16"></a> <span class="p">}</span> </span><span id="L-17"><a name="L-17"></a> <span class="p">}</span> </span><span id="L-18"><a name="L-18"></a> <span class="p">}</span> </span><span id="L-19"><a name="L-19"></a> </span><span id="L-20"><a name="L-20"></a> <span class="k">return</span> <span class="nx">flattened</span><span class="p">;</span> </span><span id="L-21"><a name="L-21"></a> </span><span id="L-22"><a name="L-22"></a> <span class="p">}</span> </span><span id="L-23"><a name="L-23"></a> </span><span id="L-24"><a name="L-24"></a> <span class="kd">var</span> <span class="nx">input</span> <span class="o">=</span> <span class="p">[</span><span class="s1">&#39;dog&#39;</span><span class="p">,</span><span class="s1">&#39;cat&#39;</span><span class="p">,</span><span class="s1">&#39;mouse&#39;</span><span class="p">,[</span><span class="s1">&#39;banana&#39;</span><span class="p">,</span><span class="s1">&#39;orange&#39;</span><span class="p">,</span><span class="s1">&#39;apple&#39;</span><span class="p">,[</span><span class="mi">7</span><span class="p">,</span><span class="mi">4</span><span class="p">,[</span><span class="s1">&#39;hello&#39;</span><span class="p">],</span><span class="mi">9</span><span class="p">]]];</span> </span><span id="L-25"><a name="L-25"></a> </span><span id="L-26"><a name="L-26"></a> <span class="nx">flatten</span><span class="p">(</span><span class="nx">input</span><span class="p">,</span><span class="kc">true</span><span class="p">,</span><span class="s1">&#39;|&#39;</span><span class="p">);</span> </span><span id="L-27"><a name="L-27"></a><span class="p">})();</span> </span></pre></div> </td></tr></table>
"array flattener", "array implode", array, flatten, flattener, implode, javascript, js