reflect.Len() Function in Golang with Examples
Go language provides inbuilt support implementation of run-time reflection and allowing a program to manipulate objects with arbitrary types with the help of reflect package. The reflect.Len() Function in Golang is used to get the v’s length. To access this function, one needs to imports the reflect package in the program.
Syntax:
func (v Value) Len() int
Parameters: This function does not accept any parameter.
Return Value: This function returns v’s length
Below examples illustrate the use of the above method in Golang:
Example 1:
package main
import (
"fmt"
"reflect"
)
func main() {
c := make(chan int , 1)
vc := reflect.ValueOf(c)
succeeded := vc.TrySend(reflect.ValueOf(123))
fmt.Println(succeeded, vc.Len(), vc.Cap())
}
|
Output:
true 1 1
Example 2:
package main
import (
"fmt"
"reflect"
)
func main() {
data := []string{ "Geeks1" , "Geeks2" , "Geeks3" }
test(data)
data1 := [] int {1, 2, 3}
test(data1)
}
func test(t interface{}) {
switch reflect.TypeOf(t).Kind() {
case reflect.Slice:
s := reflect.ValueOf(t)
for i := 0; i < s.Len(); i++ {
fmt.Println(s.Index(i))
}
}
}
|
Output:
Geeks1
Geeks2
Geeks3
1
2
3
Last Updated :
03 May, 2020
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