What Is the Difference Between new and make in Go

Use new to allocate zeroed memory for a single value and make to initialize slices, maps, and channels. new returns a pointer to the zero value, while make returns the initialized type itself.

// new returns a pointer to a zeroed int
i := new(int) 

// make returns an initialized slice
s := make([]int, 5)

// make returns an initialized map
m := make(map[string]int)

// make returns an initialized channel
ch := make(chan int)

Use new when you need a pointer to a single variable that starts at zero. Use make when you need to create a slice, map, or channel that is ready to use immediately. Think of new as reserving an empty box and make as setting up a tool that is ready to work.