Multiple Return Values

Similar to passing multiple arguments into a function, we can also retrieve multiple data values from the function.

The syntax for defining a function with multiple return values is as follows:

func myFunc(param_1 int, ...) (datatype_1, datatype_2, ...) {
      return expression_1, expression_2, ...
}

Below is an example of a function that returns two distinct values:

index.go


              12345678910111213141516171819202122
            
package main
import "fmt"

func getGroup(n int) string {
      if (n % 2 == 0) {
            return "Even"
      } else {
            return "Odd"
      }
}


func evaluateNumber(n int) (int, string) {
      var square int = n*n
      var group string = getGroup(n)
     
      return square, group
}

func main() {
      fmt.Println(evaluateNumber(5)) // Outputs: 25 Odd
}

The returned values can be stored using the following syntax:

index.go


              1234
            
// Syntax: var variable_1, variable_2, ... = myFunc(...)
var val_1, val_2 = evaluateNumber(5)
fmt.Println("Square:", val_1)
fmt.Println("Group:", val_2)

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Sectie 4. Hoofdstuk 5

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Cursusinhoud

Introduction to GoLang

1. Getting Started

2. Data Types

Integers Floating-Point Numbers Booleans Runes Strings Basic Type Casting String Formatting Challenge: String Formatting Practice

3. Control Structures

Comparison Operators Conditional Statements Conditional Chaining Logical Operators Switch Statement For Loop Break Statement Challenge: Practicing For Loop

4. Functions

5. Arrays and Slices

6. Intro to Structs & Maps

Creating Structs Creating Instances of Structs Data in Structs What are Maps?Map Declaration and Initialization Accessing Map Values Deleting Keys From Maps Challenge: Creating a Structure

Multiple Return Values

Similar to passing multiple arguments into a function, we can also retrieve multiple data values from the function.

The syntax for defining a function with multiple return values is as follows:

func myFunc(param_1 int, ...) (datatype_1, datatype_2, ...) {
      return expression_1, expression_2, ...
}

Below is an example of a function that returns two distinct values:

index.go


              12345678910111213141516171819202122
            
package main
import "fmt"

func getGroup(n int) string {
      if (n % 2 == 0) {
            return "Even"
      } else {
            return "Odd"
      }
}


func evaluateNumber(n int) (int, string) {
      var square int = n*n
      var group string = getGroup(n)
     
      return square, group
}

func main() {
      fmt.Println(evaluateNumber(5)) // Outputs: 25 Odd
}

The returned values can be stored using the following syntax:

index.go


              1234
            
// Syntax: var variable_1, variable_2, ... = myFunc(...)
var val_1, val_2 = evaluateNumber(5)
fmt.Println("Square:", val_1)
fmt.Println("Group:", val_2)

Was alles duidelijk?

Bedankt voor je feedback!

Sectie 4. Hoofdstuk 5