35 lines
661 B
Go
35 lines
661 B
Go
|
package helpers
|
||
|
|
|
||
|
|
import "strings"
|
||
|
|
|
||
|
|
func Join(elems []interface{}, sep string) string {
|
||
|
|
firstElemt, ok := elems[0].(string)
|
||
|
|
if !ok {
|
||
|
|
panic("cannot join a slice that contains something else than strings")
|
||
|
|
}
|
||
|
|
switch len(elems) {
|
||
|
|
case 0:
|
||
|
|
return ""
|
||
|
|
case 1:
|
||
|
|
|
||
|
|
return firstElemt
|
||
|
|
}
|
||
|
|
n := len(sep) * (len(elems) - 1)
|
||
|
|
for i := 0; i < len(elems); i++ {
|
||
|
|
n += len(elems[i].(string))
|
||
|
|
}
|
||
|
|
|
||
|
|
var b strings.Builder
|
||
|
|
b.Grow(n)
|
||
|
|
b.WriteString(firstElemt)
|
||
|
|
for _, s := range elems[1:] {
|
||
|
|
b.WriteString(sep)
|
||
|
|
elem, ok := s.(string)
|
||
|
|
if !ok {
|
||
|
|
panic("cannot join a slice that contains something else than strings")
|
||
|
|
}
|
||
|
|
b.WriteString(elem)
|
||
|
|
}
|
||
|
|
return b.String()
|
||
|
|
}
|