How Can I Apply Functions to List Elements Concisely in Go?

Concise Function Application to List Elements in Go

Python programmers are familiar with the便捷的list comprehensionfor applying functions to list elements. However, in Go, a more explicit loop-based approach is typically used.

Here's a code snippet demonstrating the traditional approach in Go:

list := []int{1, 2, 3}
list2 := []int{}

for _, x := range list {
    list2 = append(list2, multiply(x, 2))
}

str := strings.Join(list2, ", ")

Is there a more concise way to do this in Go?

Introducing Go 1.18's Generic Map Function

With the release of Go 1.18, a generic Map function was introduced. It allows for the concise application of functions to list elements and the generation of a new list containing the transformed values.

func Map[T, V any](ts []T, fn func(T) V) []V {
    result := make([]V, len(ts))
    for i, t := range ts {
        result[i] = fn(t)
    }
    return result
}

Usage Example

The Map function can be used as follows:

input := []int{4, 5, 3}
outputInts := Map(input, func(item int) int { return item + 1 })
outputStrings := Map(input, func(item int) string { return fmt.Sprintf("Item:%d", item) })

Conclusion

The generic Map function in Go 1.18 provides a succinct and efficient way to apply functions to list elements, creating a new list with the transformed values. It simplifies the code and enhances readability.

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