How Can Go 1.18 Streamline List Element Transformation?

Quick and Easy List Element Transformation in Go

When tasked with applying a function to each element within a list and compiling the results into a new list, you might find yourself utilizing a conventional loop-based approach similar to the example below:

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

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

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

While this method serves its purpose, it lacks the brevity and elegance found in Python's comprehension syntax.

Fortunately, with the introduction of Go 1.18 , a more streamlined generic Map function has emerged:

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
}

This Map function allows for a much cleaner transformation of list elements:

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) })

With this new approach, you can apply functions to list elements with ease and efficiency, empowering your Go code with the same level of conciseness and power found in Python.

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