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Introduction to GoLang
course content

Kurssisisältö

Introduction to GoLang

Introduction to GoLang

1. Getting Started
What is Go Programming Language?Hello WorldComments in GoBasics of VariablesModifying Variable ValuesConstantsBasics of Operators & ExpressionsChallenge: Hello WorldChallenge: Comments in GoChallenge: Basics of VariablesChallenge: Constants
2. Data Types
IntegersFloating-Point NumbersBooleansRunesStringsBasic Type CastingString FormattingChallenge: String Formatting Practice
3. Control Structures
Comparison OperatorsConditional StatementsConditional ChainingLogical OperatorsSwitch StatementFor LoopBreak StatementChallenge: Practicing For Loop
4. Functions
Declaring and Defining FunctionsLocal and Global ScopesPassing Data into the FunctionsReturn Values from FunctionsMultiple Return ValuesPassing Functions as ArgumentsChallenge: Reviewing Concepts of Functions
5. Arrays and Slices
Declaring ArraysAccessing and Modifying Array ElementsSlicesLength vs CapacityMulti-Dimensional ArraysIterating Over ArraysPassing Variable Number of Arguments into FunctionsPassing Arrays into FunctionsChallenge: Finding the Largest Element in a Grid
6. Intro to Structs & Maps
Creating StructsCreating Instances of StructsData in StructsWhat are Maps?Map Declaration and InitializationAccessing Map ValuesDeleting Keys From MapsChallenge: Creating a Structure

book
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

index.go

copy

              
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

index.go

copy

              
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)
question mark

Complete the following code by selecting an appropriate answer:

Select the correct answer

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Osio 4. Luku 5

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course content

Kurssisisältö

Introduction to GoLang

Introduction to GoLang

1. Getting Started
What is Go Programming Language?Hello WorldComments in GoBasics of VariablesModifying Variable ValuesConstantsBasics of Operators & ExpressionsChallenge: Hello WorldChallenge: Comments in GoChallenge: Basics of VariablesChallenge: Constants
2. Data Types
IntegersFloating-Point NumbersBooleansRunesStringsBasic Type CastingString FormattingChallenge: String Formatting Practice
3. Control Structures
Comparison OperatorsConditional StatementsConditional ChainingLogical OperatorsSwitch StatementFor LoopBreak StatementChallenge: Practicing For Loop
4. Functions
Declaring and Defining FunctionsLocal and Global ScopesPassing Data into the FunctionsReturn Values from FunctionsMultiple Return ValuesPassing Functions as ArgumentsChallenge: Reviewing Concepts of Functions
5. Arrays and Slices
Declaring ArraysAccessing and Modifying Array ElementsSlicesLength vs CapacityMulti-Dimensional ArraysIterating Over ArraysPassing Variable Number of Arguments into FunctionsPassing Arrays into FunctionsChallenge: Finding the Largest Element in a Grid
6. Intro to Structs & Maps
Creating StructsCreating Instances of StructsData in StructsWhat are Maps?Map Declaration and InitializationAccessing Map ValuesDeleting Keys From MapsChallenge: Creating a Structure

book
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

index.go

copy

              
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

index.go

copy

              
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)
question mark

Complete the following code by selecting an appropriate answer:

Select the correct answer

Oliko kaikki selvää?

Miten voimme parantaa sitä?

Kiitos palautteestasi!

Osio 4. Luku 5
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