How do I check for an empty slice?

Question

I am calling a function that returns an empty array if there are no values.

When I do this it doesn't work:

if r == [] {     fmt.Println("No return value")             } 

The work around I'm using is:

var a [0]int if r == a {     fmt.Println("No return value")             } 

But declaring a variable just to check the return value doesn't seem right. What's the better way to do this?

Answer 1

len() returns the number of elements in a slice or array.

Assuming whatever() is the function you invoke, you can do something like:

r := whatever() if len(r) > 0 {   // do what you want } 

or if you don't need the items

if len(whatever()) > 0 {   // do what you want }