35. Go - Variadic

Variadic functions can accept any number of inputs.


Example:

// variadic parameter must be only argument or the last argument.

// takes in 0 or more values

package main

import "fmt"

func main() {
    printEverything("hello", "hello", "hello", "hello", "hello", "hello", "hello")
}

func printEverything(s ...string) {
    if len(s) != 0 {
        for i := 0; i < len(s); i++ {
            fmt.Println(s[i])
        }

        fmt.Println("Length:", len(s))
    }
}


Using variadic to get all values from a slice:

// "y..." means pull all value from y slice

package main

import "fmt"

func main() {
    x := []int{1, 2, 3}
    y := []int{4, 5, 6}
    x = append(x, y...)
    fmt.Println(x)
}


Using variadic of interface to get any type of value:

package main

import (
    "fmt"
)

func main() {
    variadicExample(1, "red", true, 10.5, []string{"foo", "bar", "baz"},
        map[string]int{"apple": 23, "tomato": 13})
}

func variadicExample(i ...interface{}) {
    for _, v := range i {
        fmt.Println(v)
    }
}


Using variadic to create dynamic arrays:

// let compiler figure out the length

package main

import "fmt"

func main() {
    x := [...]int{1, 2, 3, 4, 5, 6, 7, 8, 9}
    fmt.Println(x)
}


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