Golang : Clearing slice
Slice is something that I use frequently in Go and I always prefer slice to array at anytime. If you are new to Go and wonder what exactly slice is. See this article about the difference between array and slice. http://blog.golang.org/slices Basically.... Slice is a better version of Array.
There are times I need to recycle a slice or need to clear the slice and there are two methods to clear the slice.
//first method :
slice = nil
// second method :
slice = slice[0:0]
The codes below demonstrate how to clear a slice with the 2 methods.
clearslice.go
package main
import (
"fmt"
)
func printslice(slice []string) {
fmt.Println("slice = ", slice)
for i := range slice {
fmt.Println(i, slice[i])
}
}
func main() {
data := []string{"a", "b", "c", "d"}
printslice(data)
// clear the slice - the first way
data = nil
// see the slice content
printslice(data)
data2 := []string{"a", "b", "c", "d"}
printslice(data2)
// clear the slice - the second way
data2 = data[0:0]
// see the slice content
printslice(data2)
}
Output :
slice = [a b c d]
0 a
1 b
2 c
3 d
slice = []
slice = [a b c d]
0 a
1 b
2 c
3 d
slice = []
By Adam Ng
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