twigfiddle.com - Fiddle dlxj9g v1 - Created on May 28, 2021 12:24

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=== Before: ===

{% for myVar in someArray %}    
    {% if myVar in someOtherArray|keys %}
       {{ myVar }} exists within someOtherArray.
    {% else %}
       {{ myVar }} doesn't exist within someOtherArray.
    {% endif %}
{% endfor %}

=== After: ===

{{ someArray|map(myVar => myVar ~ (myVar not in someOtherArray|keys ? ' doesn\'t') ~ ' exists within someOtherArray.')|join('\n') }}

Format

someArray:
  - A
  - B
  - C
  - D
  - E
  - F

someOtherArray:
  A: 1
  C: 2
  E: 3
  G: 4

Fiddle dlxj9g created on May 28, 2021 12:24 and visited 514 times

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