Cursusinhoud

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

Map Declaration and Initialization

We can declare an empty map using the make() function. Below is the syntax we need to follow:

var mapName = make(map[keyType]valueType)
// or
mapName := make(map[keyType]valueType)

Here, mapName is the name of the map, keyType is the expected type of the keys, and valueType is the expected type of the values. The term map is a keyword.

We can declare a map called courseData with keys of type string and values of type int.

index.go


              1
            
var courseData = make(map[string]int)

If we attempt to output this map, we will receive an output indicating an empty map:

index.


              1
            
fmt.Println(courseData) // Output: map[]

We can initialize a map with some data using the following syntax:

var mapName = map[keyType]valueType = {
    key1: value1,    
    key2: value2,
    key3: value 3,
    …
}

Note

You can place or omit spaces in the map declaration syntax; therefore, both map[keyType]valueType and map [keyType] valueType are valid.

Using the above syntax, we can create a map that has some initial data in it:

index.go


              1234567
            
myMap := map[string]int {
	"a": 10,
	"b": 11,
	"c": 12,
}

fmt.Println(myMap) // Output: map[a:10 b:11 c:12]

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Sectie 6. 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

Map Declaration and Initialization

We can declare an empty map using the make() function. Below is the syntax we need to follow:

var mapName = make(map[keyType]valueType)
// or
mapName := make(map[keyType]valueType)

Here, mapName is the name of the map, keyType is the expected type of the keys, and valueType is the expected type of the values. The term map is a keyword.

We can declare a map called courseData with keys of type string and values of type int.

index.go


              1
            
var courseData = make(map[string]int)

If we attempt to output this map, we will receive an output indicating an empty map:

index.


              1
            
fmt.Println(courseData) // Output: map[]

We can initialize a map with some data using the following syntax:

var mapName = map[keyType]valueType = {
    key1: value1,    
    key2: value2,
    key3: value 3,
    …
}

Note

You can place or omit spaces in the map declaration syntax; therefore, both map[keyType]valueType and map [keyType] valueType are valid.

Using the above syntax, we can create a map that has some initial data in it:

index.go


              1234567
            
myMap := map[string]int {
	"a": 10,
	"b": 11,
	"c": 12,
}

fmt.Println(myMap) // Output: map[a:10 b:11 c:12]

Was alles duidelijk?

Bedankt voor je feedback!

Sectie 6. Hoofdstuk 5