How to determine whether an array is empty in golang

Array is one of the most commonly used data structures in Go language programming. As the name suggests, an array refers to a series of collections of data of the same type. Each data contained in the array is called an array element, and the number of elements an array contains is called the length of the array. One thing that needs to be emphasized is that the length of arrays in Go language is fixed and cannot be expanded.

java determines whether an array is empty:

package main
 
import "fmt"
 
func main() {
	var arr []string
	
	if arr == nil {
		fmt.Println("this is null")
	}
 
	if len(arr) > 0 {
		fmt.Println("len arr > 0")
	}else{
		fmt.Println("len this is null")
	}
	
	if arr[0] != "" {
		fmt.Println("arr 0 != null")	
	}else{
		fmt.Println("[0] this is null")
	}
 
}

nil in Go is equivalent to NULL, null and None in other languages. When used, it means that a certain variable is empty.

For more golang knowledge, please pay attention to the golang tutorial column.

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