iterations results from the CPAN

HP-Handy
  {% if x is none %}          Value is undef (None)
  {% if x is string %}        Value is a non-reference scalar
  {% if x is number %}        Value is numeric
  {% if x is sequence %}      Value is an array reference
  {% if x is mapping %}       Value is a hash reference
  {% if x is iterable %}      Value is array or hash reference
  {% if x is callable %}      Value is a code reference
  {% if n is odd %}           Integer is odd
  {% if n is even %}          Integer is even
  {% if n is divisibleby 3 %} Integer is divisible by N
  {% if s is upper %}         String is all uppercase
  {% if s is lower %}         String is all lowercase
  {% if x is equalto y %}     Value equals y
  {% if x is not none %}      Negation of test

[ 6. Conditional ]

  {% if condition %}
      ...
  {% elif other_condition %}
      ...
  {% else %}
      ...
  {% endif %}

  Inline conditional (ternary):
    {{ "yes" if flag else "no" }}
    {{ value if value is defined else "default" }}

[ 7. For loop ]

  {% for item in list %}
      {{ loop.index }}: {{ item }}
  {% endfor %}

  Loop with else (shown when list is empty):
  {% for item in list %}
      {{ item }}
  {% else %}
      (no items)
  {% endfor %}

  Loop with filter:
  {% for item in list if item != "" %}
      {{ item }}
  {% endfor %}

  Dict iteration (key, value pairs sorted by key):
  {% for key, value in mapping %}
      {{ key }}: {{ value }}
  {% endfor %}

  loop special variable:
    loop.index      1-based counter
    loop.index0     0-based counter
    loop.revindex   reverse counter (1-based)
    loop.revindex0  reverse counter (0-based)
    loop.first      true on first iteration
    loop.last       true on last iteration
    loop.length     total number of items
    loop.odd        true on odd-numbered iterations (1st, 3rd, ...)
    loop.even       true on even-numbered iterations (2nd, 4th, ...)

[ 8. Set ]

  {% set x = 42 %}
  {% set greeting = "Hello, " ~ name %}
  {% set items = [1, 2, 3] %}

[ 9. Include ]

  {% include "header.html" %}
  {% include "optional.html" ignore missing %}

  Variables from the calling template are accessible in the included file.

[ 10. Template inheritance ]

  base.html:
    <html>
    <head><title>{% block title %}Default{% endblock %}</title></head>
    <body>{% block content %}{% endblock %}</body>
    </html>

  child.html:
    {% extends "base.html" %}
    {% block title %}My Page{% endblock %}
    {% block content %}<p>Hello</p>{% endblock %}

  Note: HP::Handy supports single-level inheritance only.
  super() (calling parent block content) is not supported.

[ 11. Macros ]

  Define:
    {% macro input(name, value="", type="text") %}
        <input type="{{ type }}" name="{{ name }}" value="{{ value }}">
    {% endmacro %}

  Call:
    {{ input("username") }}
    {{ input("password", type="password") }}

[ 12. With ]

  {% with x = 10, y = 20 %}
      {{ x + y }}
  {% endwith %}

[ 13. Raw ]

  {% raw %}
      {{ this is not rendered }}
      {% nor is this %}
  {% endraw %}

[ 14. Expressions ]

  Arithmetic:   +  -  *  /  //  %  **
  Concatenation: ~  (e.g. "Hello" ~ " " ~ name)
  Comparison:   ==  !=  <  >  <=  >=
  Logic:        and  or  not
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