Functions

normal functions(single and multiple return), variadic functions, anonymous functions

Syntax:

func name_of_func(first, two) return_type{

    return variable

}

Takes two input integer and returns an integer (common int type input if both are the same type else individually)

package main

import (
	"fmt"
)

func plus(a ,b int) int{

	return a + b 
}

func main() {
	
	r := plus(3,4)
	fmt.Println(r)
		
}

Multiple return from function

package main

import (
	"fmt"
)

func plus(a ,b int) (int,int){
	
	c := a + b
	d := a*b
	return c,d 
}

func main() {
	
	r,r1 := plus(3,4)
	fmt.Println(r,r1)
		
}

Question: you can also pass list

Answer:

Multiple Arguments passing and receiving

package main

import (
	"fmt"
)


// receiving multiple elements as arguments in func
func sum(num ...int){
i:=0 
total := 0
for i=0; i< len(num); i++ {
	total = total + num[i]

}
fmt.Println(total)

}

func main() {
	
// variable length is denoted by ... in go

	sum(1,2)
	
	sum(1,2, 23,53,4)
	
	// passing multiple elements in collections
	nums := []int{1,2,3,4}
	sum(nums...)

}

Functions examples

Closures

• anonymous functions

• closures

package main

import (
	"fmt"
)


func do_something(i int) func() int{

	return func() int{
	i = i+1
	return i
	
	}
	
}

func main() {
	
	// annonymous function
	variable := do_something(3)
	fmt.Println(variable())

}

Recursion

package main

import (
	"fmt"
)

// passess something as an argument to function do_something
func do_something(i int) int{
// returns an anonymous function with return type
	if i == 0 {
	return 1
	}
	x := i*do_something(i-1)
	return x
}

func main() {
	// annonymous function
	fmt.Println(do_something(3))
}