🌟 Go 1.23 Extends For-Range Loops with New Range Types

Go 1.23 introduces a progressive update for for-range loops, now supporting a wider array of range types. This enhancement simplifies handling complex range expressions, making your code cleaner and more versatile.

Go 1.23 was released like a month ago, but I was unable to cover that release earlier due to vacation season. But it’s not that bad, because I can do it for you now. There are various interesting features and fixes in this release.

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But for me the most peculiar is the extended range clause in a for-range loop. It accepts now these types as range expressions.

func(func() bool)
func(func(K) bool)
func(func(K, V) bool)

Range-over function was made available in Go as far away as Go 1.18. You can read about it here.

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Here’s a nice example that shows the power of range over function:

// LongStrings returns a slice of just the values
// in m whose length is n or more.
func LongStrings(m map[int]string…