How Can I Efficiently Retrieve the Last Element of a Go Slice in a Template?

Retrieving the Last Element of a Slice in a Go Template

In Go templates, accessing the size and indexing elements of a slice is straightforward using len .Things and index .Things n, respectively. However, retrieving the last element can be challenging due to zero-based indexing.

To circumvent this issue without defining custom functions, we can utilize a FuncMap to add a custom "add" function:

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

With this function in place, we can index the slice and retrieve the last element as follows:

{{index .Things (add $size -1)}}

This approach provides a concise and efficient way to access the last element of a slice in a Go template, without the need for additional function definitions.

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