variadicAndDeferred.md

Variadic Functions

• Functions can take a variable number of arguments
• Use ellipsis … to specify
• Treated as a slice inside function
• Can pass a slice to a variadic function
• Need the … suffix

package main

import "fmt"
func getMax(vals ...int) int {
	maxV := -1
	for _, v := range vals {
		if v > maxV {
			maxV = v
		}
	}
	return maxV
}

func main() {
    fmt.Println(getMax(1, 3, 6, 4))
    vslice := []int{1, 3, 6, 4}
    fmt.Println(getMax(vslice...))
}

Deferred Functions

• Call can be deferred until the surrounding function completes
• Typically used for cleanup activities
• Arguments of a deferred call are evaluated immediately. So, i will be printed as 2.

package main

import "fmt"
func main(){
	i := 1
	defer fmt.Println(i+1)
	i++
	fmt.Println("Hello!")
}