render_classes
The render_classes function can convert an array into a string suited for html class-attribute.
{{ render_classes(['class1', 'class2']) }}
{# outputs "class1 class2" #}
It ignores empty spaces:
{{ render_classes(['class1',' ', '', 'class2']) }}
{# outputs "class1 class2" #}
It also ignores values not considered suitable for classes:
{{ render_classes(false, 'class1', 'class2', null) }}
{# outputs "class1 class2" #}
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