Shopify's Liquid truthiness in various scenarios

shopify-liquid-truthiness

{% comment %}
Shopify's Liquid truthiness in various scenarios.

---

value: true
results:
    true: true
    false: false
    truthy: true
    falsy: false
    undefined: false
    nil: false
    blank: false
    empty: false
    empty str: false
    is zero: false

value: false
results:
    true: false
    false: true
    truthy: false
    falsy: true
    undefined: false
    nil: false
    blank: true
    empty: false
    empty str: false
    is zero: false

value:  'test'
results:
    true: false
    false: false
    truthy: true
    falsy: false
    undefined: false
    nil: false
    blank: false
    empty: false
    empty str: false
    is zero: false

value:  123
results:
    true: false
    false: false
    truthy: true
    falsy: false
    undefined: false
    nil: false
    blank: false
    empty: false
    empty str: false
    is zero: false

value:  0
results:
    true: false
    false: false
    truthy: true
    falsy: false
    undefined: false
    nil: false
    blank: false
    empty: false
    empty str: false
    is zero: true

value: ''
results:
    true: false
    false: false
    truthy: true
    falsy: false
    undefined: false
    nil: false
    blank: true
    empty: true
    empty str: true
    is zero: false

value: ' '
results:
    true: false
    false: false
    truthy: true
    falsy: false
    undefined: false
    nil: false
    blank: true
    empty: false
    empty str: false
    is zero: false

value: nil
results:
    true: false
    false: false
    truthy: false
    falsy: true
    undefined: true
    nil: true
    blank: true
    empty: false
    empty str: false
    is zero: false

value: undefined
results:
    true: false
    false: false
    truthy: false
    falsy: true
    undefined: true
    nil: true
    blank: true
    empty: false
    empty str: false
    is zero: false

value: non-existent variable
results:
    true: false
    false: false
    truthy: false
    falsy: true
    undefined: true
    nil: true
    blank: true
    empty: false
    empty str: false
    is zero: false

---

Test Framework Below:
{% endcomment %}

{% assign test_true = true %}
{% assign test_false = false %}
{% assign test_str = 'test' %}
{% assign test_num = 123 %}
{% assign test_num_zero = 0 %}
{% assign test_empty_str = '' %}
{% assign test_space_str = ' ' %}
{% assign test_nil = nil %}
{% assign test_undefined = undefined %}

{% comment %} Change this to assign a value to be tested {% endcomment %}
{% assign test_subject = test_undefined %}

<!-- test subject: {{ test_subject | json }} -->

{% if test_subject == true %}
<!-- truthy: true -->
{% else %}
<!-- truthy: false -->
{% endif %}

{% if test_subject == true %}
<!-- true: true -->
{% else %}
<!-- true: false -->
{% endif %}

{% if test_subject == false %}
<!-- false: true -->
{% else %}
<!-- false: false -->
{% endif %}

{% if test_subject %}
<!-- truthy: true -->
{% else %}
<!-- truthy: false -->
{% endif %}

{% unless test_subject %}
<!-- falsy: true -->
{% else %}
<!-- falsy: false -->
{% endunless %}

{% if test_subject == nil %}
<!-- nil: true -->
{% else %}
<!-- nil: false -->
{% endif %}

{% if test_subject == blank %}
<!-- blank: true -->
{% else %}
<!-- blank: false -->
{% endif %}

{% if test_subject == empty %}
<!-- empty: true -->
{% else %}
<!-- empty: false -->
{% endif %}

{% if test_subject == '' %}
<!-- empty str: true -->
{% else %}
<!-- empty str: false -->
{% endif %}

{% if test_subject == 0 %}
<!-- is zero: true -->
{% else %}
<!-- is zero: false -->
{% endif %}