proposal: slices.Last: return the last element of a non-empty slice

[adonovan]

A common operation is to access the last element of a slice. When the slice is not in a variable this can be cumbersome because of the need to repeat the argument.

We propose to add the Last function to the slices package.

package slices

// Last returns the last element of a non-empty slice.
func Last[S ~[]E, E any](slice S) E {
	return slice[len(slice)-1]
}

[gabyhelp]

Related Issues and Documentation

• slices: add Reverse #58565 (closed)
• proposal: slices: LastIndex and LastIndexFunc #60480 (closed)
• proposal: slices: add LastIndex and LastIndexFunc #63128
• proposal: x/exp/slices: add First and Last #53510 (closed)
• proposal: Go 2: add Reverse function to new slices package #47988 (closed)

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[adonovan]

Hmm, Gaby turned up something my search through (open) proposals did not:

• proposal: x/exp/slices: add First and Last #53510 (comment)

It appears we have been here before and decided against it.

[zigo101]

also see: #25594

[seankhliao]

Given that it was only recently declined, let's close as

Duplicate of #53510