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Go · BeginnerSnippet

Variable Declarations

In Go, you can declare variables using the 'var' keyword with an explicit type, or the short declaration operator ':=' which infers the type automatically.

snippet.go

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package main
 
import "fmt"
 
func main() {
    var name string = "Gopher"
    age := 10
    fmt.Printf("%s is %d years old", name, age)
}

syntaxdatatypes

Go · BeginnerSnippet

Working with Slices

Slices are dynamic windows into arrays. Unlike arrays, slices can grow in size using the built-in 'append' function.

snippet.go

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fruits := []string{"apple", "banana"}
fruits = append(fruits, "cherry")
fmt.Println(fruits[1]) // "banana"

arraysdatatypes

Go · BeginnerSnippet

The For Loop

Go only has one looping construct: 'for'. It can be used as a standard C-style loop or as a 'while' loop by omitting the initialization and post statements.

snippet.go

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for i := 0; i < 5; i++ {
    fmt.Println("Iteration:", i)
}
 
// While-like loop
sum := 1
for sum < 10 {
    sum += sum
}

controlflowsyntax

Go · BeginnerSnippet

Error Handling Pattern

Instead of using exceptions, Go uses explicit error checking. Functions return an 'error' type as their last return value, which should be checked immediately.

snippet.go

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result, err := doSomething()
if err != nil {
    fmt.Println("Error occurred:", err)
    return
}
fmt.Println("Success:", result)

errorhandlingbestpractices

Go · BeginnerSnippet

Basic Arrays

Arrays in Go have a fixed length that is part of their type. Once defined, their size cannot change.

snippet.go

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package main
 
import "fmt"
 
func main() {
    var ids [3]int
    ids[0] = 101
    ids[1] = 102
    ids[2] = 103
 
    names := [2]string{"Alice", "Bob"}
    fmt.Println(ids, names)
}

arraysdatatypes

Go · BeginnerSnippet

Conditional Logic with If-Else

The if statement evaluates a boolean condition. Parentheses are not used around the condition, but curly braces for the block are mandatory.

snippet.go

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package main
 
import "fmt"
 
func main() {
    temp := 25
    if temp > 30 {
        fmt.Println("It is hot")
    } else if temp > 20 {
        fmt.Println("It is nice")
    } else {
        fmt.Println("It is cold")
    }
}

controlflowsyntax

Go · BeginnerSnippet

Defining Structs

Structs are used to group related data together. Unlike classes in other languages, Go uses structs to define the shape of data objects.

snippet.go

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package main
 
import "fmt"
 
type User struct {
    Username string
    Email    string
    Active   bool
}
 
func main() {
    u := User{Username: "coder123", Email: "[email protected]", Active: true}
    fmt.Println(u.Username)
}

datatypessyntax

Go · BeginnerSnippet

Working with Maps

Maps are Go's built-in associative data type (hash tables). they store data in key-value pairs.

snippet.go

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package main
 
import "fmt"
 
func main() {
    menu := map[string]float64{
        "Coffee": 2.50,
        "Tea":    2.00,
    }
 
    menu["Juice"] = 3.25
    delete(menu, "Tea")
 
    fmt.Println(menu)
}

datatypessyntax