How to Write Data to CSV in Go
In Go, you can use the standard library package encoding/csv [docs] to write data to a CSV file. Below is a example that shows you how you can write a slice of user-data related strings to a CSV file. The code creates a new file called users.csv and writes a slice of records to it. Finally, the Flush method is used to flush any buffered data to the underlying io.Writer, which is the file.
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.