How Do I Get the Last Element of a Go Slice in a Template?

Obtaining the Last Element of a Slice in Go Templates

In Go templates, while you can easily determine the size of a slice using len, getting the last element can be tricky since indexing is zero-based.

Using a FuncMap

Rather than defining custom functions, Go templates provide the flexibility of extending functionality through FuncMaps. Let's create a "subtract" function that handles this scenario and similar arithmetic needs:

t := template.Must(template.New("").Funcs(template.FuncMap{
    "subtract": func(a, b int) int { return a - b },
}).Parse(theTemplate)

In your template, you can now utilize this function as follows:

{{index .Things (subtract $size 1)}}

This expression would effectively retrieve the last element of the slice by subtracting 1 from its length to compensate for zero-based indexing.

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