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Stephen Dolan committed 2012-10-22 23:13:39 +01:00
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@@ -125,6 +125,10 @@
"`keys`" : "keys",
"`select`" : "select",
"`empty`" : "empty",
"`map(x)`" : "mapx",
"`add`" : "add",
@@ -1023,6 +1027,99 @@
</section>
<section id="select">
<h3>
<p><code>select</code></p>
</h3>
<p>The function <code>select(foo)</code> produces its input unchanged if <code>foo</code> returns true for that input, and produces no output otherwise.</p>
<p>It&#8217;s useful for filtering lists: <code>[1,2,3] | select(. &gt;= 2)</code> will give you <code>[3]</code>.</p>
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Example
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<table class="manual-example">
<tr><th></th><td class="jqprogram">jq 'select(. >= 2)'</td></tr>
<tr><th>Input</th><td>[1,5,3,0,7]</td></tr>
<tr>
<th>Output</th>
<td>[5,3,7]</td>
</tr>
</table>
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</div>
</section>
<section id="empty">
<h3>
<p><code>empty</code></p>
</h3>
<p><code>empty</code> returns no results. None at all. Not even <code>null</code>.</p>
<p>It&#8217;s useful on occasion. You&#8217;ll know if you need it :)</p>
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<tr><th></th><td class="jqprogram">jq '1, empty, 2'</td></tr>
<tr><th>Input</th><td>null</td></tr>
<tr>
<th>Output</th>
<td>12</td>
</tr>
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<table class="manual-example">
<tr><th></th><td class="jqprogram">jq '[1,2,empty,3]'</td></tr>
<tr><th>Input</th><td>null</td></tr>
<tr>
<th>Output</th>
<td>[1,2,3]</td>
</tr>
</table>
</div>
</div>
</section>
<section id="mapx">
<h3>
<p><code>map(x)</code></p>
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