# Control Flow

URL: /docs/syntax/control-flow/
Section: syntax
Tags: syntax, control-flow

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Control Flow Conditionals if / elif / else &#123;% if user.is_admin %&#125; &lt;span class=&quot;badge&quot;&gt;Admin&lt;/span&gt; &#123;% elif user.is_moderator %&#125; &lt;span class=&quot;badge&quot;&gt;Mod&lt;/span&gt; &#123;% else %&#125; &lt;span class=&quot;badge&quot;&gt;User&lt;/span&gt; &#123;% end %&#125; Note: Kida uses unified &#123;% end %&#125; to close all blocks. Inline Conditionals {{ &quot;Active&quot; if is_active else &quot;Inactive&quot; }} Boolean Operators &#123;% if user and user.is_active %&#125; &#123;% if not disabled %&#125; &#123;% if a or b %&#125; &#123;% if (a and b) or c %&#125; Comparison Operators &#123;% if count &gt; 0 %&#125; &#123;% if status == &quot;active&quot; %&#125; &#123;% if value in allowed_values %&#125; &#123;% if item is defined %&#125; Loops for Loop &#123;% for item in items %&#125; &lt;li&gt;{{ item.name }}&lt;/li&gt; &#123;% end %&#125; Loop with else The else block runs when the sequence is empty: &#123;% for item in items %&#125; &lt;li&gt;{{ item.name }}&lt;/li&gt; &#123;% else %&#125; &lt;li&gt;No items found&lt;/li&gt; &#123;% end %&#125; Loop Context Access loop state via the loop variable: &#123;% for item in items %&#125; {{ loop.index }} {# 1-based index #} {{ loop.index0 }} {# 0-based index #} {{ loop.first }} {# True on first iteration #} {{ loop.last }} {# True on last iteration #} {{ loop.length }} {# Total items #} {{ loop.revindex }} {# Reverse index (1-based) #} {{ loop.revindex0 }} {# Reverse index (0-based) #} &#123;% end %&#125; Unpacking &#123;% for key, value in data.items() %&#125; {{ key }}: {{ value }} &#123;% end %&#125; &#123;% for x, y, z in coordinates %&#125; Point: ({{ x }}, {{ y }}, {{ z }}) &#123;% end %&#125; Filtering Items &#123;% for user in users if user.is_active %&#125; {{ user.name }} &#123;% end %&#125; Pattern Matching Kida adds &#123;% match %&#125; for cleaner branching: &#123;% match status %&#125; &#123;% case &quot;active&quot; %&#125; ✓ Active &#123;% case &quot;pending&quot; %&#125; ⏳ Pending &#123;% case &quot;error&quot; %&#125; ✗ Error: {{ error_message }} &#123;% case _ %&#125; Unknown status &#123;% end %&#125; Match with Guards &#123;% match user %&#125; &#123;% case {&quot;role&quot;: &quot;admin&quot;} %&#125; Full access &#123;% case {&quot;role&quot;: &quot;user&quot;, &quot;verified&quot;: true} %&#125; Standard access &#123;% case _ %&#125; Limited access &#123;% end %&#125; Variables set Assign a variable in the current scope: &#123;% set name = &quot;Alice&quot; %&#125; &#123;% set items = [1, 2, 3] %&#125; &#123;% set total = price * quantity %&#125; let Block-scoped variable (new in Kida): &#123;% let temp = calculate_value() %&#125; {{ temp }} &#123;% end %&#125; {# temp is not accessible here #} Whitespace Control Trim whitespace with -: &#123;%- if true -%&#125; trimmed &#123;%- end -%&#125; &#123;%- trims whitespace before the tag -%&#125; trims whitespace after the tag See Also Variables — Output expressions Filters — Transform values Functions — Reusable template functions

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