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| <h1 class="content-header header-section1" id="ref_builtins_hash" itemprop="headline">Built-ins for hashes</h1> |
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| <div class="page-menu-title">Page Contents</div> |
| <ul><li><a class="page-menu-link" href="#ref_builtin_keys" data-menu-target="ref_builtin_keys">keys</a></li><li><a class="page-menu-link" href="#ref_builtin_values" data-menu-target="ref_builtin_values">values</a></li></ul> </div> |
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| |
| |
| |
| <h2 class="content-header header-section2" id="ref_builtin_keys">keys</h2> |
| |
| |
| |
| |
| <p>A sequence that contains all the lookup keys in the |
| hash.</p> |
| |
| |
| |
| <div class="code-block role-template"> |
| <div class="code-block-label">Template</div><pre class="code-block-body"><#assign myHash = { "name": "mouse", "price": 50 }> |
| <#list myHash?keys as k> |
| ${k} |
| </#list></pre> </div> |
| |
| |
| |
| |
| <div class="code-block role-output"> |
| <div class="code-block-label">Output</div><pre class="code-block-body"> name |
| price</pre> </div> |
| |
| |
| <p>Note that not all hashes support this (ask the programmer if a |
| certain hash allows this or not).</p> |
| |
| <p>Since hashes do not define an order for their sub variables in |
| general, the order in which key names are returned can be arbitrary. |
| However, some hashes maintain a meaningful order (ask the programmer |
| if a certain hash does that or not). For example, hashes created |
| with the above <code class="inline-code">{<em class="code-color">...</em>}</code> |
| syntax preserve the same order as you have specified the sub |
| variables.</p> |
| |
| <div class="callout note"> |
| <strong class="callout-label">Note:</strong> |
| |
| <p>To list both the keys and the values, you can use |
| <code class="inline-code"><#list attrs as key, |
| value>...<#list></code>; see the <a href="ref_directive_list.html#ref.directive.list"><code>list</code> |
| directive</a>.</p> |
| </div> |
| |
| |
| |
| |
| |
| |
| <h2 class="content-header header-section2" id="ref_builtin_values">values</h2> |
| |
| |
| |
| |
| <p>A sequence that contains all the variables (the values in the |
| key-value pairs) in the hash.</p> |
| |
| |
| |
| <div class="code-block role-template"> |
| <div class="code-block-label">Template</div><pre class="code-block-body"><#assign myHash = { "name": "mouse", "price": 50 }> |
| <#list myHash?values as v> |
| ${v} |
| </#list></pre> </div> |
| |
| |
| |
| |
| <div class="code-block role-output"> |
| <div class="code-block-label">Output</div><pre class="code-block-body"> mouse |
| 50</pre> </div> |
| |
| |
| <p>Note that not all hashes support this (ask the programmer if a |
| certain hash allows this or not).</p> |
| |
| <p>As of the order in which the values are returned, the same |
| applies as with the <code class="inline-code">keys</code> built-in; see there. |
| Furthermore, it's not guaranteed that the order of the values |
| corresponds to the order of the keys returned by the |
| <code class="inline-code">keys</code> build-in.</p> |
| |
| <div class="callout note"> |
| <strong class="callout-label">Note:</strong> |
| |
| <p>To list both the keys and the values, you can use |
| <code class="inline-code"><#list attrs as key, |
| value>...<#list></code>; see the <a href="ref_directive_list.html#ref.directive.list"><code>list</code> |
| directive</a>.</p> |
| </div> |
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