Go 1.18 will be a significant release and contains a lot of new features. One of them is generics which you can experiment yourself with using either the playground or gotip.
Examples:
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December 7, 2021 19:08
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Go 1.18 - Generics
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| // Go 1.17 | |
| func ValToPtr(val interface{}) *interface{} { | |
| return &val | |
| } | |
| strPtr := ValToPtr("Foo") | |
| integerPtr := ValToPtr(1) | |
| // Go 1.18 | |
| func ValToPtr[T any](val T) *T { | |
| return &val | |
| } | |
| strPtr := ValToPtr("Foo") | |
| integerPtr := ValToPtr(1) |
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| // Go 1.17 | |
| func MaxInt(input []int) (max int) { | |
| for _, v := range input { | |
| if v > max { | |
| max = v | |
| } | |
| } | |
| return max | |
| } | |
| func MaxFloat32(input []float32) (max float32) { | |
| for _, v := range input { | |
| if v > max { | |
| max = v | |
| } | |
| } | |
| return max | |
| } | |
| maxFloat32 := MaxFloat32([]float32{1.2, 8.2, 4.2}) | |
| maxInt := MaxInt([]int{1, 8, 4}) | |
| // Go 1.18 | |
| func Max[T constraints.Ordered](input []T) (max T) { | |
| for _, v := range input { | |
| if v > max { | |
| max = v | |
| } | |
| } | |
| return max | |
| } | |
| maxFloat32 := Max([]float32{1.2, 8.2, 4.2}) | |
| maxInt := Max([]int{1, 8, 4}) |
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| // Go 1.17 | |
| func DoStuffForStr(val string) { | |
| // Do stuff | |
| } | |
| func DoStuffForInt(val int) { | |
| // Do stuff | |
| } | |
| DoStuffForStr("1") | |
| DoStuffForInt(1) | |
| // Go 1.18 | |
| type CustomConstraint interface { | |
| type string, int | |
| } | |
| func DoStuff[T CustomConstraint](val T) { | |
| // Do stuff | |
| } | |
| DoStuff("1") | |
| DoStuff(1) |
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| // Go 1.17 | |
| type StrCollection []string | |
| func (c StrCollection) Print() { | |
| // Do stuff | |
| } | |
| type IntCollection []int | |
| func (c IntCollection) Print() { | |
| // Do stuff | |
| } | |
| coll1 := StrCollection{"1", "2", "3"} | |
| coll1.Print() | |
| coll2 := IntCollection{1, 2, 3} | |
| coll2.Print() | |
| // Go 1.18 | |
| type CustomConstraint interface { | |
| type string, int | |
| } | |
| type Collection[T CustomConstraint] []T | |
| func (c Collection[T]) Print() { | |
| // Do stuff | |
| } | |
| coll1 := Collection[T string]{"1", "2", "3"} | |
| coll1.Print() | |
| coll2 := Collection[T int]{1, 2, 3} | |
| coll2.Print() |
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