How to Efficiently Scan Multiple Numbers into a Slice in Go?

Scanning Numbers into Slices in Go

When reading multiple numbers from standard input in Go, you can assign values to individual variables:

numbers := make([]int, 2)
fmt.Fscan(os.Stdin, &numbers[0], &numbers[1])

However, you may want to simplify the process and read directly into a slice. The fmt package doesn't support scanning into slices, but the following utility function can help:

func packAddrs(n []int) []interface{} {
    p := make([]interface{}, len(n))
    for i := range n {
        p[i] = &n[i]
    }
    return p
}

This function creates a slice of addresses for each element in the input slice. With this function, you can scan into a slice like this:

numbers := make([]int, 2)
n, err := fmt.Fscan(os.Stdin, packAddrs(numbers)...)
fmt.Println(numbers, n, err)

Testing this with fmt.Sscan():

numbers := make([]int, 5)
n, err := fmt.Sscan("1 3 5 7 9", packAddrs(numbers)...)
fmt.Println(numbers, n, err)

Output:

[1 3 5 7 9] 5 <nil>

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