Posted on Mar 16, 2022

Go 1.18 is released today 🎉 Let's try some yammy Generics

#go

Go 1.18 is released today! Download the latest version here

Let's try a library called "lo" for common generics operations. The lo library is similar to Javascript's lodash.

Example:

package main

import (
    "fmt"

    "github.com/samber/lo"
)

func main() {
    nums := []int{1, 2, 3}

    lo.ForEach(nums, func(t int, i int) {
        fmt.Println(t)
    })

    doubles := lo.Map(nums, func(num int, _ int) int {
        return num * 2
    })
    fmt.Println("doubles:", doubles)

    odds := lo.Filter(nums, func(v int, _ int) bool {
        return v%2 != 0
    })
    fmt.Println("odds:", odds)

    lo.Shuffle(nums)
    fmt.Println("randomed:", nums)

    reversed := lo.Reverse(nums)
    fmt.Println("reversed:", reversed)

    if idx := lo.IndexOf(nums, 3); idx != -1 {
        fmt.Println("Found 3")
    } else {
        fmt.Println("Not found 3")
    }

    ele, found := lo.Find(nums, func(v int) bool {
        return v == 2
    })
    fmt.Println("Found:", found, "Element:", ele)

    arr := lo.Range(5)
    fmt.Println("array:", arr)

    // get map.keys
    m := map[string]string{
        "name":  "John",
        "score": "A",
    }
    fmt.Println(lo.Keys(m))
    fmt.Println(lo.Values(m))

    for _, item := range lo.Entries(m) {
        fmt.Println("Key:", item.Key, "=>", "Value:", item.Value)
    }
}

Run it:

$ go run main.go
1
2
3
doubles: [2 4 6]
odds: [1 3]
randomed: [1 3 2]
reversed: [2 3 1]
Found 3
Found: true Element: 2
array: [0 1 2 3 4]
[name score]
[John A]
Key: name => Value: John
Key: score => Value: A