Why new keyword in golang

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#1

I have golang code scores := new([]int), I’m really confusing with this how we can use the scores variable for storing scores of a match

#2

See the documentation:

The built-in function new takes a type T, allocates storage for a variable of that type at run time, and returns a value of type *T pointing to it.

We can split this:

type intslice []int

func main() {
	scores := new(intslice)
	fmt.Printf("%T %v\n", scores, scores)
}

Output:

*main.intslice &[]

Let’s add some ints to it:

    t := append(*scores, 1, 2, 3)
    scores = &t
    fmt.Printf("%T %v\n", scores, scores)

Output:

*main.intslice &[1 2 3]

https://play.golang.com/p/eOHyVN1Cbk6

#3

How this way make arrays instead of slices

#4

Well, an array has a fixed size. So an array of 10 ints has type [10]int, but you do not need new() to create it.

A simple example can be seen here:

https://play.golang.org/p/AQA9cGTn6y8

#5

Do you need an array with a fixed size? Or do you need a slice that can be appended to? Depending on the answer Go provides different keywords and different syntax.