What is the purpose of the dash ('-') in Go template conditionals?

Understanding Dash in Go Templates

In Go templates, you may encounter the use of dashes (-) within conditionals. For example, the following code snippet demonstrates the usage:

{{- if hasKey .Values.mymap "mykey" }}
    # Conditional code goes here...
{{- end }}

What is the purpose of the dash ("-") in this statement?

The dash serves a specific function in Go templates: it modifies the whitespace handling around the content it encloses. It removes any trailing spaces from the template output on the side where it appears. Let's delve deeper into this behavior:

Within the {{- if ...}} block, the dash removes trailing spaces before the if statement. This means that any text or HTML immediately preceding the if statement will appear without any spaces between them and the conditional output.

On the other hand, within the {{- end }} block, the dash removes trailing spaces after the end tag. This ensures that any text or HTML following the end tag will appear immediately after the conditional output, again without any intervening spaces.

This functionality is particularly useful when creating templates that must be visually clean and free from unnecessary whitespace. By removing trailing spaces, dashess allow for seamless integration of conditional content into the template output.

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