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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

bookConstants

Constants are similar to variables, but once declared and initialized, their value cannot be altered, which is why they are called "constants."

The syntax for declaring a constant is similar to that of a variable. However, in this case, we use the keyword const instead of var.

Note

The := operator cannot be used for declaring constants as it is reserved solely for variable declarations.

If we attempt to modify the value of constants, the compiler may produce an error, as illustrated in the following code:

go

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12345678

            
package main
import "fmt"

func main() {
    const value = 5
    value = 7 // Error expected at this line
    fmt.Println(value)
}

Constants are employed for storing values that are frequently utilized throughout the program and are intended to remain unaltered. These may include mathematical constants, configuration values, or system limits.

Effectively utilizing constants can reduce the likelihood of errors, such as modifying values that should remain constant. Additionally, it enhances code readability and comprehensibility for readers by clearly indicating which values remain constant throughout the program.

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Section 1. Chapter 6
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