Find the Length of an Array

You can find the length of an array, or to be correct a slice or map, in Go by using the standard library function len(). We use the term array loosely here, as a general variable holding multiple things. Maps tend to have defined keys, whereas slices don’t (more info on the difference here). We have shown both as examples below, how to get the length of a slice and how to get the length of a map.