Go Notes

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Syntax & Overview:

• Statically typed
• Compiled ('go run file_name.go'), simpler than C++'s 'g++ filename.cpp' -> './a.out'
• packages similiar to python modules but different syntax, ie:
  package main
  import ("fmt")
• No semicolons necessary, unlike C/C++, but curly braces used. Functions start with func, arguments must include type, and output type must also be specified.
• General structure:

packages 
imports
func(arg type) ouput_type {
  function details
}

package main
import "fmt"
func add_567(num int) int {
  var sum int 
  i := 567
  sum = num + i
  return sum
}
func main() {
  fmt.Println(add_567(5))
}

---

No defined keyword for while loops, instead use for loop as in this simple guessing game.

package main
import (

	"fmt"
	"math/rand"
)

func generate_random() int {
	fmt.Println("Generating random number...")
	num := rand.Intn(100)
	fmt.Println(num)
	return num

}
func try() int {
	var inp int
	fmt.Println("Guess a number between 1 and 100:")
	fmt.Scan(&inp)
	return inp
}

func main() {
	var randm int = generate_random()
	var guess int
	guess = try()
	for tries := 4; tries > 0; tries-- {

---

Infinite Loops can be used with:

for {
  function
}

Like python, JS, and many other languages, Go contains useful iterative tools like map, range, continue, break, etc.

Accessing items in an array in Go is made fairly simple and intuitive with the map function. If we have an array of resistors, with resistance and SMT package size, we can access and print the array:

package main
import "fmt"

func main() {

    resistors := map[int]string{
        200: "0805",
        150: "0605",
    }

    for index, value := range resistors {
        fmt.Println("Resistance: ", index, "Size: ", value)
    }

}

(Used type string for package size instead of int just to show declaration method)
Learning the implementation of the map function in Go actually also improved my understanding and encouraged me to learn more about it, and implement it more frequently in python.