twig - building array in for loop

Question

is it possible to iteratively fill a twig array with values?

{% for question in questions %} {% set multipleChoiceArray = [] %}     {% for multipleChoice in question.multipleChoiceAnswers %}         {% set multipleChoiceArray = multipleChoiceArray|merge( multipleChoice.answerText )  %}     {% endfor %} {% endfor %} 

the problem is here multipleChoiceArray|merge(multipleChoice.answerText)

when i try to pass an array for example with key = loop.index like

{% set multipleChoiceArray = multipleChoiceArray|merge({"loop['index']":"multipleChoice['answerText']"})  %} 

it works but the array contains the strings "["loop['index']":"multipleChoice['answerText']"]"

when i try to pass variables like :

{% set multipleChoiceArray = multipleChoiceArray|merge({loop.index:multipleChoice.answerText})  %} 

exception is : A hash key must be followed by a colon (:). Unexpected token "punctuation" of value "." ("punctuation" expected with value ":")

so i am not able to "push" a value "multipleChoice.answerText" into "multipleChoiceArray"

any hints how that is possible ? i just want to gather all possible answers and later check if answer is in that array and count sth up and display

Answer 1

The argument of merge has to be an array or object to merge it with an existing one. So write it as an array with one element.

{% set multipleChoiceAnswerText = multipleChoice.answerText %} {% set multipleChoiceArray = multipleChoiceArray|merge([multipleChoice.answerText])  %}