Syntax example scan sheet for Golang.

up_to_speed.go

// Go scan sheet / Cheat Sheet

// main package
package main

// imports
import (
        "fmt"
        "io/ioutil"
        "os"
)

// define a struct
type Person struct {
        FirstName string
        LastName  string
        Age       int
}

// functions
func greet(name string) string {
        return "Hello " + name + "!"
}

// variables
func main() {
        // creating an instance of Person
        person1 := Person{"John", "Doe", 30}

        // accessing fields of the struct
        fmt.Println("First Name:", person1.FirstName)
        fmt.Println("Last Name:", person1.LastName)
        fmt.Println("Age:", person1.Age)

        // instance with field names
        person2 := Person{
                FirstName: "Alice",
                LastName:  "Smith",
                Age:       28,
        }

        var integerVar int = 10
        stringVar := "Hello, Go!"

        // functions
        fmt.Println(greet("World"))

        // loops
        // for loop
        for i := 0; i < 5; i++ {
                fmt.Println("For loop iteration:", i)
        }

        // conditional Statements
        if integerVar > 5 {
                fmt.Println("Integer is greater than 5")
        } else if integerVar == 5 {
                fmt.Println("Integer is 5")
        } else {
                fmt.Println("Integer is less than 5")
        }

        // conditional statements using switch
        switch {
        case integerVar > 5:
                fmt.Println("Integer is greater than 5")
        case integerVar == 5:
                fmt.Println("Integer is 5")
        default:
                fmt.Println("Integer is less than 5")
        }

        // data structures
        mySlice := []int{1, 2, 3, 4, 5}
        myMap := map[string]int{"a": 1, "b": 2}

        // error handling
        _, err := os.Open("nonexistent_file.txt")
        if err != nil {
                fmt.Println("Error opening file:", err)
        }

        // concurrency
        c := make(chan int)
        go sum(mySlice, c)
        fmt.Println("Sum from channel:", <-c)

        // writing to a file
        content := []byte("Writing to a file in Go!")
        ioutil.WriteFile("example.txt", content, 0644)

        // reading from a file
        data, _ := ioutil.ReadFile("example.txt")
        fmt.Println("File content:", string(data))
}

// goroutine for summing elements
func sum(slice []int, c chan int) {
        sum := 0
        for _, value := range slice {
                sum += value
        }
        c <- sum // send sum to channel
}