How to Handle the Last Element in Go's Text Template Comma-Separated Lists?

Last Element Treatment in Go's Text Templates

When using Go's text templates to generate a comma-separated list, it becomes necessary to handle the comma placement for the last element differently.

Solution:

The solution involves utilizing a template's ability to assign variables during iteration. By assigning a second variable to the iteration index, we can distinguish the last element from the others. The following template demonstrates this:

{{ $i := . }}
({{ range $i }}{{ . }}, {{if eq $index (len $. - 1)}}{{/* Empty */}}{{else}},{{end}}{{end}})

In this template, we initialize a variable $i to the slice of values passed to the template. Within the range iteration, we assign a second variable $index to the index of each element.

Explanation:

• We use {{range $i}} to iterate over the slice, setting $i to each element.
• The {{if eq $index (len $. - 1)}} expression checks if the current $index equals the length of the slice minus one, which is true for the last element.
• When the condition is true, the {{/* Empty */}} directive is executed, which does nothing (comment in template).
• When false, we output a comma (`,

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