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77 lines
2.1 KiB
Markdown
77 lines
2.1 KiB
Markdown
---
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title: Truthy and falsy
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---
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In programming, anything that returns `true` in a conditional is called **truthy**. Anything that returns `false` in a conditional is called **falsy**. All object types can be described as either truthy or falsy.
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- [Truthy](#truthy)
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- [Falsy](#falsy)
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- [Summary](#summary)
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## Truthy
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All values in Liquid are truthy except `nil` and `false`.
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In the example below, the string "Tobi" is not a boolean, but it is truthy in a conditional:
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```liquid
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{% raw %}
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{% assign tobi = "Tobi" %}
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{% if tobi == true %}
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This condition will always be true.
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{% endif %}
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{% endraw %}
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```
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[Strings](/basics/types/#string), even when empty, are truthy. The example below will result in empty HTML tags if `settings.fp_heading` is empty:
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```liquid
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{% raw %}
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{% if settings.fp_heading %}
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<h1>{{ settings.fp_heading }}</h1>
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{% endif %}
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{% endraw %}
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```
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```html
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<h1></h1>
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```
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[EmptyDrops](/basics/types/#emptydrop) are also truthy. In the example below, if `settings.page` is an empty string or set to a hidden or deleted object, you will end up with an EmptyDrop. The result is an empty `div`:
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```liquid
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{% raw %}
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{% if pages[settings.page] %}
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<div>{{ pages[settings.page].content }}</div>
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{% endif %}
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{% endraw %}
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```
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```html
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<div></div>
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```
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## Falsy
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The falsy values in Liquid are [`nil`](/basics/types/#nil) and [`false`](/basics/types/#boolean).
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## Summary
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The table below summarizes what is truthy or falsy in Liquid.
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| | truthy | falsy |
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| ------------- |:-------------:|:-------------:|
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| true | • | |
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| false | | • |
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| nil | | • |
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| string | • | |
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| empty string | • | |
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| 0 | • | |
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| integer | • | |
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| float | • | |
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| array | • | |
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| empty array | • | |
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| page | • | |
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| EmptyDrop | • | |
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