How to Prevent a Comma After the Last Item in a Go Templates Range?

Detecting the Last Item in an Array with Go Templates Range

This program currently prints the following output:

1,4,2,

However, the desired output is:

1,4,2.

Each item in the array is currently being suffixed with a comma. To modify this behavior and ensure that only the last item is suffixed with a period, we can modify the Go template used for iteration:

tpl := "{{range $i, $el := .items}}{{if $i}},{{end}}{{$el}}{{end}}."

The key change is the addition of the {{if $i}},{{end}} statement, which conditionally adds a comma separator.

• For the first item in the array ($i == 0), the comma is not printed.
• For subsequent items ($i > 0), the comma is printed.

By placing the comma inside the conditional statement, we ensure that it is only printed for non-first items. The final dot (.), following the end of the range loop, adds the desired period after the last item.

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