Word truncate in Twig template

Follow the below code to achieve your word truncate in twig template:
It is done in a Drupal project so you can pick up the concept from here, not by doing copy paste code to achieve your result.

{% set field_description = view.style_plugin.getField(key, 'field_name')|render|striptags %}

{% set field_description_array = field_description|split(' ') %}

{% if field_description_array|length > 20 %}

    {% set word = 20 %}

    {% for i in range(1, word) %}

        {{ field_description_array[i] }}

    {% endfor %}

    {{ '...' }}

{% else %}

    {% for key,value in field_description_array %}

        {{ value }}

    {% endfor %}

{% endif %}

Happy coding!