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 stdlib function
len(). We’ve shown some examples below to create both a slice and a map then get the length of it. In Golang, the method is the same for both.
Length of Slice
We define the entire slice in one go, but you can also use
append() to add to the slice. We create a slice of three item then print out the length.
Length of Map
A map holds a key/value pair and our example below uses a string for both the key and value. We create three items on the map, then print out the length.