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Go (Golang): Your Cheatsheet On Ways To Create New Maps And Slices. There are quite a few ways to create new maps and slices in Go. Which one is best? Or perhaps better asked, which is best in your situation? Let's take a look at how to create a new map and a new slice using Go's make() and varStyle is the best way to declare an empty slice. Make() allows the slice to be initialized with a starting length and capacity, which can have good performance implications.