e245fb76de
Functional programming for the win! Add a utility function to map the values of a slice, along with a curried variant, to tide us over until equivalent functionality gets added to the standard library (https://go.dev/issue/61898) Signed-off-by: Cory Snider <csnider@mirantis.com>
49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
package sliceutil_test
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import (
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"net/netip"
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"strconv"
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"testing"
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"github.com/docker/docker/internal/sliceutil"
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)
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func TestMap(t *testing.T) {
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s := []int{1, 2, 3}
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m := sliceutil.Map(s, func(i int) int { return i * 2 })
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if len(m) != len(s) {
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t.Fatalf("expected len %d, got %d", len(s), len(m))
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}
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for i, v := range m {
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if expected := s[i] * 2; v != expected {
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t.Fatalf("expected %d, got %d", expected, v)
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}
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}
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}
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func TestMap_TypeConvert(t *testing.T) {
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s := []int{1, 2, 3}
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m := sliceutil.Map(s, func(i int) string { return strconv.Itoa(i) })
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if len(m) != len(s) {
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t.Fatalf("expected len %d, got %d", len(s), len(m))
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}
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for i, v := range m {
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if expected := strconv.Itoa(s[i]); v != expected {
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t.Fatalf("expected %s, got %s", expected, v)
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}
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}
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}
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func TestMapper(t *testing.T) {
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s := []string{"1.2.3.4", "fe80::1"}
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mapper := sliceutil.Mapper(netip.MustParseAddr)
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m := mapper(s)
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if len(m) != len(s) {
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t.Fatalf("expected len %d, got %d", len(s), len(m))
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}
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for i, v := range m {
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if expected := netip.MustParseAddr(s[i]); v != expected {
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t.Fatalf("expected %s, got %s", expected, v)
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}
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}
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}
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