Go language: Return a value from function

Functions in Go can be written zero or more values.

Syntax

func functionName(parameters) returnType{

         statements

        

         return value

}

You can return a value from a function using ‘return’ keyword.

func add(a int, b int) int{

         return a + b

}

HelloWorld.go

package main

import "fmt"

func main() {

 result := add(10, 20)

 fmt.Println("Sum of 10 and 20 is : ", result)

}

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

Output

Sum of 10 and 20 is :  30

Returning multiple values from a function

You can return multiple values from a function­­.

Syntax

func functionName(parameters) (returnType1, … returnType N){

         statements

        

         return value1, … valueN

}

Example

func arithmetic(a int, b int) (int, int, int, int){

         return a + b, a - b, a *b, a / b

}

HelloWorld.go

package main

import "fmt"

func main() {

 addition, subtraction, multiplication, division := arithmetic(10, 20)

 fmt.Println("Sum of 10 and 20 is : ", addition)
 fmt.Println("Subtraction of 10 and 20 is : ", subtraction)
 fmt.Println("Multiplication of 10 and 20 is : ", multiplication)
 fmt.Println("Division of 10 and 20 is : ", division)

}

func arithmetic(a int, b int) (int, int, int, int){
 return a + b, a - b, a *b, a / b
}

Output

Sum of 10 and 20 is :  30

Subtraction of 10 and 20 is :  -10

Multiplication of 10 and 20 is :  200

Division of 10 and 20 is :  0

Named parameters

Just add the names to the return types in function signature.

Example

func arithmetic(a int, b int) (sum int, sub int, mul int, div int){

         sum =  a + b

         sub = a - b

         mul = a *b

         div = a / b

         return

}

HelloWorld.go

package main

import "fmt"

func main() {

 addition, subtraction, multiplication, division := arithmetic(10, 20)

 fmt.Println("Sum of 10 and 20 is : ", addition)
 fmt.Println("Subtraction of 10 and 20 is : ", subtraction)
 fmt.Println("Multiplication of 10 and 20 is : ", multiplication)
 fmt.Println("Division of 10 and 20 is : ", division)

}

func arithmetic(a int, b int) (sum int, sub int, mul int, div int){
 sum =  a + b
 sub = a - b
 mul = a *b
 div = a / b

 return
}

Output

Sum of 10 and 20 is :  30

Subtraction of 10 and 20 is :  -10

Multiplication of 10 and 20 is :  200

Division of 10 and 20 is :  0

A return statement without arguments returns the named return values. This is known as a "naked" return.

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