how to set default value for bool variable

[aimuke]

{% assign varA = false %}
{{ varA | default: true }}

I want to get the value of varA, but, Liquiddefault filter will set the value only if “the left side is nil, false, or empty”. So I always get ture.
How sould I get the value of varA? thx.

[fw42]

{{ varA }}?

[aimuke]

thanks. @fw42 .

The variable varA may be empty which I want to set it to true. If I use {{ varA }}, I cannot get the default value.

[ashmaroli]

Workarounds

• If you just wanna render the value:

  {%- if varA == false -%}
    false
  {%- else -%}
    {{ varA | default: true }}
  {%- endif -%}
  
• Or if you're just gonna use it in a conditional:

  {%- if varA -%}
    cookie!
  {%- else -%}
    no cookie!
  {%- endif -%}
  

[aimuke]

thx, @ashmaroli

Yes, I can do it like this. thx.

[CrazyOrr]

The default filter

Allows you to specify a fallback in case a value doesn’t exist. default will show its value if the left side is nil, false, or empty.

This fallback rule shouldn't apply when a variable has a boolean value of false, which does "exist" and doesn't need to be fallbacked on.

[dylanahsmith]

Looks like we are missing documentation on https://shopify.github.io/liquid/filters/default/ for the allow_false keyword argument to the default filter, although there is documentation for it in the source code

liquid/lib/liquid/standardfilters.rb

Lines 434 to 437 in c7c21e8

	# Use `allow_false` when an input should only be tested against nil or empty and not false.
	#
	# Example:
	# {{ product.title | default: "No Title", allow_false: true }}

[ashmaroli]

@dylanahsmith The commit that introduced allow_false haven't been released yet. So, documenting it on https://shopify.github.io/liquid/filters/default/ is going to create confusion..