Handy snippets for generating common list comprehension function implementaions for your type(s) in golang

fp.go

// Replace "X" and "Y" with your desired types

func mapXtoY(collection []X, fn func(elem X) Y) []Y {
	var result []Y
	for _, item := range collection {
		result = append(result, fn(item))
	}
	return result
}

func reduceXtoY(collection []X, init Y, fn func(memo Y, elem X) Y) Y {
	result := init
	for _, item := range collection {
		result = fn(result, item)
	}
	return result
}

func filterXs(collection []X, fn func(elem X) bool) []X {
	var result []X
	for _, item := range collection {
		if fn(item) {
			result = append(result, item)
		}
	}
	return result
}