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<!DOCTYPE html>
<html lang="en" class="dark">
<head>
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                    <h1 class="text-2xl font-bold">Go Lang Cheatsheet</h1>
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                <h2 class="text-xl font-semibold mb-4 text-go-blue">Variables & Types</h2>

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                    <h3 class="font-medium mb-2">Variable Declaration</h3>
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                        <pre><code class="language-go">// Short declaration (inside functions)
x := 42
name := "Gopher"

// Explicit typing
var count int = 10
var pi float64 = 3.14159

// Multiple variables
var a, b int = 1, 2
c, d := 3, "four"</code></pre>
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                    <h3 class="font-medium mb-2">Basic Types</h3>
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                        <pre><code class="language-go">bool    // true/false
string  // "hello"

int     // Platform-dependent size
int8    // -128 to 127
int64   // -2^63 to 2^63-1

uint    // Unsigned
uintptr // For pointers

byte    // alias for uint8
rune    // alias for int32 (Unicode)

float32 // 32-bit float
float64 // 64-bit float

complex64  // float32 real + imaginary
complex128 // float64 real + imaginary</code></pre>
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                <h2 class="text-xl font-semibold mb-4 mt-8 text-go-blue">Control Flow</h2>

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                    <h3 class="font-medium mb-2">If/Else</h3>
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                        <pre><code class="language-go">// Basic if
if x > 0 {
    return "positive"
}

// With short statement
if err := doSomething(); err != nil {
    log.Fatal(err)
}

// If-else chain
if num < 0 {
    fmt.Println("Negative")
} else if num == 0 {
    fmt.Println("Zero")
} else {
    fmt.Println("Positive")
}</code></pre>
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                    <h3 class="font-medium mb-2">Basic Function</h3>
                    <div class="code-block bg-gray-100 dark:bg-gray-900 p-4 rounded">
                        <pre><code class="language-go">// Simple function
func greet(name string) string {
    return "Hello, " + name
}

// Multiple return values
func swap(x, y string) (string, string) {
    return y, x
}

// Named return values
func split(sum int) (x, y int) {
    x = sum * 4 / 9
    y = sum - x
    return // "naked" return
}</code></pre>
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                    <h3 class="font-medium mb-2">Variadic Functions</h3>
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                        <pre><code class="language-go">func sum(nums ...int) int {
    total := 0
    for _, num := range nums {
        total += num
    }
    return total
}

// Usage
fmt.Println(sum(1, 2, 3)) // 6
numbers := []int{4, 5, 6}
fmt.Println(sum(numbers...)) // 15</code></pre>
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                <h2 class="text-xl font-semibold mb-4 text-go-blue">Structs & Methods</h2>

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                    <h3 class="font-medium mb-2">Struct Definition</h3>
                    <div class="code-block bg-gray-100 dark:bg-gray-900 p-4 rounded">
                        <pre><code class="language-go">type Person struct {
    Name string
    Age  int
}

// Initialization
p1 := Person{"Alice", 30}
p2 := Person{Name: "Bob", Age: 25}
p3 := new(Person) // Returns pointer

// Anonymous struct
point := struct {
    X, Y int
}{10, 20}</code></pre>
                    </div>
                </div>

                <div class="mb-6">
                    <h3 class="font-medium mb-2">Methods</h3>
                    <div class="code-block bg-gray-100 dark:bg-gray-900 p-4 rounded">
                        <pre><code class="language-go">// Value receiver
func (p Person) Greet() string {
    return fmt.Sprintf("Hi, I'm %s", p.Name)
}

// Pointer receiver (can modify struct)
func (p *Person) Birthday() {
    p.Age++
}

// Usage
person := Person{"Charlie", 40}
person.Greet() // "Hi, I'm Charlie"
person.Birthday() // Age now 41</code></pre>
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                </div>
            </div>

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                <h2 class="text-xl font-semibold mb-4 text-go-blue">Concurrency</h2>

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                    <h3 class="font-medium mb-2">Goroutines</h3>
                    <div class="code-block bg-gray-100 dark:bg-gray-900 p-4 rounded">
                        <pre><code class="language-go">// Basic goroutine
go func() {
    fmt.Println("Running in background")
}()

// With parameters
msg := "Hello"
go func(m string) {
    fmt.Println(m)
}(msg)</code></pre>
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                </div>

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                    <h3 class="font-medium mb-2">Channels</h3>
                    <div class="code-block bg-gray-100 dark:bg-gray-900 p-4 rounded">
                        <pre><code class="language-go">// Unbuffered channel
ch := make(chan string)

// Buffered channel
bufCh := make(chan int, 100)

// Send/receive
go func() { ch <- "ping" }()
msg := <-ch // "ping"

// Channel directions
func sendOnly(ch chan<- string) { /* can only send */ }
func receiveOnly(ch <-chan string) { /* can only receive */ }</code></pre>
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