Cast

Set of generic helpers for converting slices to their underlying type.

It's fast and allocs free when purego build tag is disabled.

Supported types

string
uint8
uint16
uint32
uint64
int8
int16
int32
int64
float32
float64
complex64
complex128
int
uint

Example

package main

import (
	"fmt"

	"github.com/WinPooh32/cast"
)

type MyString string

func show(ss []string) {
	fmt.Println(ss)
}

func main() {
	mm := []MyString{"hello", "world", "list", "of", "strings"}

	ss := cast.Strings(mm)

	show(ss)
}

Output:

[hello world list of strings]

Benchmarks

goos: linux
goarch: amd64
pkg: github.com/WinPooh32/cast
cpu: AMD Ryzen 7 3700X 8-Core Processor             
Benchmark_Strings-16            559789944  2.183 ns/op   0 B/op   0 allocs/op
Benchmark_castStringsAppend-16  20688170   57.98 ns/op   80 B/op  1 allocs/op
PASS
ok      github.com/WinPooh32/cast       2.700s

castStringsAppend implementation:

func castStringsAppend[T ~string](tt []T) []string {
	if tt == nil {
		return nil
	}
	vv := make([]string, 0, len(tt))
	for _, value := range tt {
		vv = append(vv, string(value))
	}
	return vv
}