Functions

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Functions in Go
by yhuang Go fmt.Println fmt 
package main

import "fmt"

func plus(a int, b int) int {
    return a + b
}

func plusPlus(a, b, c int) int {
    return a + b + c
}

func main() {
    res := plus(1, 2)
    fmt.Println("1+2 =", res)

    res = plusPlus(1, 2, 3)
    fmt.Println("1+2+3 =", res)
}
Higher Order Functions in V
by yhuang V
A higher order function is a function that takes a function as an argument, or returns a function. Higher order function is in contrast to first order functions, which don’t take a function as an argument or return a function as output.
fn sqr(n int) int {
	return n * n
}

fn run(value int, op fn(int) int) int {
	return op(value)
}

fn main()  {
	println(run(5, sqr)) // "25"
}
Return Multiple Values in Go
by yhuang Go fmt.Println fmt
Go has built-in support for multiple return values. This feature is used often in idiomatic Go, for example to return both result and error values from a function.
package main

import "fmt"

func vals() (int, int) {
    return 3, 7
}

func main() {
    a, b := vals()
    fmt.Println(a)
    fmt.Println(b)

    // If you only want a subset of the returned values, use the blank identifier _.
    _, c := vals()
    fmt.Println(c)
}
Variadic Functions in Go
by yhuang Go fmt fmt.Print fmt.Println
Variadic functions can be called with any number of trailing arguments. For example, fmt.Println is a common variadic function.
package main

import "fmt"

func sum(nums ...int) {
    fmt.Print(nums, " ")
    total := 0
    for _, num := range nums {
        total += num
    }
    fmt.Println(total)
}

func main() {
    sum(1, 2)
    sum(1, 2, 3)

    nums := []int{1, 2, 3, 4}
    sum(nums...)
}
Closures in Go
by yhuang Go fmt.Println fmt 
package main

import "fmt"

func intSeq() func() int {
    i := 0
    return func() int {
        i++
        return i
    }
}

func main() {
    nextInt := intSeq()

    fmt.Println(nextInt())
    fmt.Println(nextInt())
    fmt.Println(nextInt())

    newInts := intSeq()
    fmt.Println(newInts())
}
Recursion in Go
by yhuang Go fmt fmt.Println 
package main

import "fmt"

func fact(n int) int {
    if n == 0 {
        return 1
    }
    return n * fact(n-1)
}

func main() {
    fmt.Println(fact(7))
}