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  <div class="section" id="using-zerolib">
<span id="index-0"></span><h1>Using ZeroLib<a class="headerlink" href="#using-zerolib" title="Permalink to this headline">¶</a></h1>
<p>In this chapter we will learn how to use the ZeroLib library.</p>
<div class="section" id="introduction">
<span id="index-1"></span><h2>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h2>
<p>ZeroLib is a simple library written in Ring.</p>
<p>The library provideds classes for Lists and String where the index starts from 0.</p>
</div>
<div class="section" id="z-function">
<span id="index-2"></span><h2>Z() function<a class="headerlink" href="#z-function" title="Permalink to this headline">¶</a></h2>
<p>Syntax:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Z(String|List) ---&gt; New Object (ZeroBasedString|ZeroBasedList)
</pre></div>
</div>
</div>
<div class="section" id="zerobasedlist-class">
<span id="index-3"></span><h2>ZeroBasedList Class<a class="headerlink" href="#zerobasedlist-class" title="Permalink to this headline">¶</a></h2>
<p>Simple class provide a List where the index starts from zero.</p>
<p>Methods:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 28%" />
<col style="width: 72%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Method</p></th>
<th class="head"><p>Description/Output</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Init(List)</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>Add(Value)</p></td>
<td><p>Add item to the list</p></td>
</tr>
<tr class="row-even"><td><p>Insert(nIndex,Value)</p></td>
<td><p>Inset Item after nIndex</p></td>
</tr>
<tr class="row-odd"><td><p>Find(Value)</p></td>
<td><p>Find item</p></td>
</tr>
<tr class="row-even"><td><p>Delete(nIndex)</p></td>
<td><p>Delete item from the list</p></td>
</tr>
<tr class="row-odd"><td><p>Item(nIndex)</p></td>
<td><p>Get item from the list</p></td>
</tr>
<tr class="row-even"><td><p>First()</p></td>
<td><p>Get the first item in the list</p></td>
</tr>
<tr class="row-odd"><td><p>Last()</p></td>
<td><p>Get the last item in the list</p></td>
</tr>
<tr class="row-even"><td><p>Set(nIndex,Value)</p></td>
<td><p>Set item value</p></td>
</tr>
<tr class="row-odd"><td><p>FindInColumn(nCol,Value)</p></td>
<td><p>Find item in a column</p></td>
</tr>
<tr class="row-even"><td><p>Sort()</p></td>
<td><p>Sort items - return new list</p></td>
</tr>
<tr class="row-odd"><td><p>Reverse()</p></td>
<td><p>Reverse items - return new list</p></td>
</tr>
<tr class="row-even"><td><p>Swap(nIndex1,nIndex2)</p></td>
<td><p>Swap two items</p></td>
</tr>
</tbody>
</table>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">load</span> <span class="s">&quot;zerolib.ring&quot;</span>

<span class="o">?</span> <span class="s">&quot;Using List - Index start from 0&quot;</span>
<span class="kt">List</span> <span class="o">=</span> <span class="n">Z</span><span class="p">(</span> <span class="o">[</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="o">]</span> <span class="p">)</span>
<span class="kt">List</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="kt">List</span><span class="p">.</span><span class="n">Add</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
<span class="o">?</span> <span class="kt">List</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">List</span><span class="o">[</span><span class="mi">1</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">List</span><span class="o">[</span><span class="mi">2</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">List</span><span class="o">[</span><span class="mi">3</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">List</span><span class="o">[</span><span class="mi">4</span><span class="o">]</span>
<span class="n">nIndex</span> <span class="o">=</span> <span class="kt">List</span><span class="p">.</span><span class="n">find</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="o">?</span> <span class="s">&quot;Find(2) = &quot;</span> <span class="o">+</span> <span class="n">nIndex</span>
<span class="kt">List</span><span class="p">.</span><span class="n">delete</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="o">?</span> <span class="s">&quot;After deleting the first item : List[0]&quot;</span>
<span class="o">?</span> <span class="s">&quot;Now List[0] = &quot;</span> <span class="o">+</span> <span class="kt">List</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="n">Using</span> <span class="kt">List</span> <span class="o">-</span> <span class="n">Index</span> <span class="n">start</span> <span class="k">from</span> <span class="mi">0</span>
<span class="mi">1</span>
<span class="mi">2</span>
<span class="mi">3</span>
<span class="mi">4</span>
<span class="mi">5</span>
<span class="n">Find</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="o">=</span> <span class="mi">1</span>
<span class="n">After</span> <span class="n">deleting</span> <span class="n">the</span> <span class="n">first</span> <span class="n">item</span> <span class="p">:</span> <span class="kt">List</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span>
<span class="n">Now</span> <span class="kt">List</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span> <span class="o">=</span> <span class="mi">2</span>
</pre></div>
</div>
</div>
<div class="section" id="zerobasedstring-class">
<span id="index-4"></span><h2>ZeroBasedString Class<a class="headerlink" href="#zerobasedstring-class" title="Permalink to this headline">¶</a></h2>
<p>Simple class provide a String where the index starts from zero.</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 28%" />
<col style="width: 72%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Method</p></th>
<th class="head"><p>Description/Output</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Init(String|Number)</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>Lower()</p></td>
<td><p>New String - Lower case characters</p></td>
</tr>
<tr class="row-even"><td><p>Upper()</p></td>
<td><p>New String - Upper case characters</p></td>
</tr>
<tr class="row-odd"><td><p>Left(x)</p></td>
<td><p>New String - contains x characters from the left</p></td>
</tr>
<tr class="row-even"><td><p>Right(x)</p></td>
<td><p>New String - contains x characters from the right</p></td>
</tr>
<tr class="row-odd"><td><p>Lines()</p></td>
<td><p>Number - Lines count</p></td>
</tr>
<tr class="row-even"><td><p>Trim()</p></td>
<td><p>New String - Remove Spaces</p></td>
</tr>
<tr class="row-odd"><td><p>Copy(x)</p></td>
<td><p>New String - repeat string x times</p></td>
</tr>
<tr class="row-even"><td><p>strcmp(cString)</p></td>
<td><p>Compare string with cString</p></td>
</tr>
<tr class="row-odd"><td><p>tolist()</p></td>
<td><p>List (String Lines to String Items)</p></td>
</tr>
<tr class="row-even"><td><p>tofile(cFileName)</p></td>
<td><p>Write string to file</p></td>
</tr>
<tr class="row-odd"><td><p>mid(nPos1,nPos2)</p></td>
<td><p>New String - from nPos1 to nPos2</p></td>
</tr>
<tr class="row-even"><td><p>getfrom(nPos1)</p></td>
<td><p>New String - from nPos1 to the end of the string</p></td>
</tr>
<tr class="row-odd"><td><p>replace(cStr1,cStr2,lCase)</p></td>
<td><p>New String - Replace cStr1 with cStr2 , lCase (True=Match Case)</p></td>
</tr>
<tr class="row-even"><td><p>split()</p></td>
<td><p>List - Each Word as list item</p></td>
</tr>
<tr class="row-odd"><td><p>startswith(substring)</p></td>
<td><p>Return true if the start starts with a substring</p></td>
</tr>
<tr class="row-even"><td><p>endswith(substring)</p></td>
<td><p>Return true if the start ends with a substring</p></td>
</tr>
</tbody>
</table>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">load</span> <span class="s">&quot;zerolib.ring&quot;</span>

<span class="o">?</span> <span class="s">&quot;Using String - Index start from 0&quot;</span>
<span class="kt">String</span> <span class="o">=</span> <span class="n">Z</span><span class="p">(</span> <span class="s">&quot;Welcome&quot;</span> <span class="p">)</span>
<span class="o">?</span> <span class="kt">String</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">String</span><span class="o">[</span><span class="mi">1</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">String</span><span class="o">[</span><span class="mi">2</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">String</span><span class="o">[</span><span class="mi">3</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">String</span><span class="o">[</span><span class="mi">4</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">String</span><span class="o">[</span><span class="mi">5</span><span class="o">]</span>
<span class="o">?</span> <span class="kt">String</span><span class="o">[</span><span class="mi">6</span><span class="o">]</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="n">Using</span> <span class="kt">String</span> <span class="o">-</span> <span class="n">Index</span> <span class="n">start</span> <span class="k">from</span> <span class="mi">0</span>
<span class="n">W</span>
<span class="n">e</span>
<span class="n">l</span>
<span class="n">c</span>
<span class="n">o</span>
<span class="n">m</span>
<span class="n">e</span>
</pre></div>
</div>
</div>
<div class="section" id="source-code">
<span id="index-5"></span><h2>Source Code<a class="headerlink" href="#source-code" title="Permalink to this headline">¶</a></h2>
<p>We can find the library source code in this folder</p>
<p>URL : <a class="reference external" href="https://github.com/ring-lang/ring/tree/master/libraries/zerolib">https://github.com/ring-lang/ring/tree/master/libraries/zerolib</a></p>
</div>
</div>


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