How to Achieve Python's List Comprehension Functionality in Go?

Python's List Comprehension Equivalent in Go

In this post, we explore ways to replicate Python's list comprehension in Go, specifically the syntax:

array = [a for a in anotherArray if (some condition)]

Utilizing the Filter Library

Go offers a filter library proposed by Rob Pike. This library provides a Choose() function that takes a slice and a boolean function as arguments. It returns a new slice containing only elements that meet the specified condition.

For example:

import "google.golang.org/x/exp/slices"

func TestChoose(t *testing.T) {
    a := []int{1, 2, 3, 4, 5, 6, 7, 8, 9}
    expect := []int{2, 4, 6, 8}
    result := slices.Choose(a, isEven)
}

Caveats of the Filter Library

While the filter library offers a convenient solution, its official documentation advises against its use, due to its decreased efficiency compared to explicit for loops.

For Loops as an Alternative

The Go documentation recommends using for loops as an alternative to list comprehensions. They offer a more efficient solution, especially in situations where one needs to control the order of operations or limit data generation.

For example, the following code calculates the minimum value in a nested loop:

min := min(abs(a[i], b[j]) for i in range(n)
                          for j in range(i, n))

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