Kursinnhold

Introduction to GoLang

1. Getting Started

What is Go Programming Language?Hello World Comments in Go Basics of Variables Modifying Variable Values Constants Basics of Operators & Expressions Challenge: Hello World Challenge: Comments in Go Challenge: Basics of Variables Challenge: Constants

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

Declaring and Defining Functions Local and Global Scopes Passing Data into the Functions Return Values from Functions Multiple Return Values Passing Functions as Arguments Challenge: Reviewing Concepts of Functions

5. Arrays and Slices

Declaring Arrays Accessing and Modifying Array Elements Slices Length vs Capacity Multi-Dimensional Arrays Iterating Over Arrays Passing Variable Number of Arguments into Functions Passing Arrays into Functions Challenge: Finding the Largest Element in a Grid

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

Data in Structs

Now that we know how to create an instance of a structure, we should learn how to store and modify data in them.

We can use the dot (.) symbol followed by the field name to reference it. Consider the example in the following program, where we create an instance of the Student class called student1:

index.go


              123456789101112131415161718192021
            
package main
import "fmt"

type Student struct {
    name   string
    age    int
    id     int
    course string
    grades [5]float32
}


func main() {
    var student1 Student

    fmt.Println("Name:", student1.name)
    fmt.Println("Age:", student1.age)
    fmt.Println("ID:", student1.id)
    fmt.Println("Course:", student1.course)
    fmt.Println("Grades:", student1.grades)
}

This is because no data was manually stored in the structure, causing each of the fields to take a default zero value based on its type.

Note

In Go, we cannot specify our own default values for the fields; it automatically assigns zero values to the fields based on their types. However, we can specify custom default values by creating a constructor function, which is beyond the scope of this course as it requires knowledge of pointers.

We can also reference and assign values to the fields using the same referencing method, for example:

index.go


              1
            
student1.name = "Leo"

Therefore, we can modify the program above to store some initial data accordingly:

index.go


              123456789101112131415161718192021222324252627
            
package main
import "fmt"

type Student struct {
    name   string
    age    int
    id     int
    course string
    grades [5]float32
}


func main() {
    var student1 Student
   
    student1.name = "Leo"
    student1.age = 21
    student1.id = 121
    student1.course = "CS"
    student1.grades = [5] float32 { 4.5, 4.55, 4.49, 4.92, 5.0 }
   
    fmt.Println("Name:", student1.name)
    fmt.Println("Age:", student1.age)
    fmt.Println("ID:", student1.id)
    fmt.Println("Course:", student1.course)
    fmt.Println("Grades:", student1.grades)
}

Note

The fields of a struct are also referred to as members.

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Takk for tilbakemeldingene dine!

Seksjon 6. Kapittel 3

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Kursinnhold

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

Data in Structs

Now that we know how to create an instance of a structure, we should learn how to store and modify data in them.

We can use the dot (.) symbol followed by the field name to reference it. Consider the example in the following program, where we create an instance of the Student class called student1:

index.go


              123456789101112131415161718192021
            
package main
import "fmt"

type Student struct {
    name   string
    age    int
    id     int
    course string
    grades [5]float32
}


func main() {
    var student1 Student

    fmt.Println("Name:", student1.name)
    fmt.Println("Age:", student1.age)
    fmt.Println("ID:", student1.id)
    fmt.Println("Course:", student1.course)
    fmt.Println("Grades:", student1.grades)
}

This is because no data was manually stored in the structure, causing each of the fields to take a default zero value based on its type.

Note

In Go, we cannot specify our own default values for the fields; it automatically assigns zero values to the fields based on their types. However, we can specify custom default values by creating a constructor function, which is beyond the scope of this course as it requires knowledge of pointers.

We can also reference and assign values to the fields using the same referencing method, for example:

index.go


              1
            
student1.name = "Leo"

Therefore, we can modify the program above to store some initial data accordingly:

index.go


              123456789101112131415161718192021222324252627
            
package main
import "fmt"

type Student struct {
    name   string
    age    int
    id     int
    course string
    grades [5]float32
}


func main() {
    var student1 Student
   
    student1.name = "Leo"
    student1.age = 21
    student1.id = 121
    student1.course = "CS"
    student1.grades = [5] float32 { 4.5, 4.55, 4.49, 4.92, 5.0 }
   
    fmt.Println("Name:", student1.name)
    fmt.Println("Age:", student1.age)
    fmt.Println("ID:", student1.id)
    fmt.Println("Course:", student1.course)
    fmt.Println("Grades:", student1.grades)
}

Note

The fields of a struct are also referred to as members.

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 6. Kapittel 3