I read document says the format for jinja2 for loop and macro are as below
{% for my_item in my_collection %}
{% endfor %}
{% macro macro_name(arg1, arg2) %}
{% endmacro %}
But when I read someone's code, there always have a dash(-) next to the %. like
{% for my_item in my_collection -%}
{% endfor -%}
{%- macro macro_name(arg1, arg2) -%}
{%- endmacro -%}
Is there a reason for the dash or it is purely cosmatic and can be ignored?