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Introduction to GoLang
course content

Course Content

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

bookPassing Variable Number of Arguments into Functions

In the previous section, we explored functions; however, we didn't delve into a specific type of function called variadic functions. These are functions that can accept a variable number of arguments. Now that we have some understanding of arrays, let's take a closer look at variadic functions.

Variadic functions are a special type of function that can accept a variable number of arguments. The syntax for declaring a variadic function is as follows:

To define a variadic function, we use the ... syntax followed by the variable's type. For example:

In this example, myFunction is a variadic function that can accept any number of integer arguments. The term args in this context represents an array containing all the arguments passed to the function, making it effectively an array of type int.

For instance, we can create a function called sum that accepts a variable number of int numbers and returns the sum of those numbers:

go

index

copy

              
12345678910111213141516

            
package main
import "fmt"

func sum(args ...int) int {
    var total int = 0
    for i := 0; i < len(args); i++ {
        total += args[i]
    }
    return total
}

func main() {
    fmt.Println(sum(1, 2, 3)) // Output: 6
    fmt.Println(sum(2, 5, 7, 9, 12)) // Output: 35
    fmt.Println(sum(47, 100, 121, 50)) // Output: 318
}

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Section 5. Chapter 7
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