Exploring Golang features

You can incorporate these code snippets into your larger programming modules. This repository is viewable on sourcegraph.com.

Contents

The proper way to copy a slice

package main

import "fmt"

func main() {
	a := []string{"a", "b", "c", "d"}
	e := make([]string, len(a))
	copy(e, a)
	fmt.Println(e)
}

How to find out the data type?

// Figure out what type it is: maps, slices, or arrays!

package main

import (
	"fmt"
	"reflect"
)

func main() {

	// Declaring local variables
	map1 := map[string]string{"name": "John", "desc": "Golang"}
	map2 := map[string]int{"apple": 23, "tomato": 13}
	slice1 := []int{1, 2, 3}
	array1 := [3]int{1, 2, 3}
	// var m map[string]int
	// m = make(map[string]int)
	// More info Here: https://blog.golang.org/go-maps-in-action

	// Type, such as map[string]string, []int, [3]int
	fmt.Println("map1:", reflect.TypeOf(map1))
	fmt.Println("map2:", reflect.TypeOf(map2))
	fmt.Println("slice1:", reflect.TypeOf(slice1))
	fmt.Println("array1:", reflect.TypeOf(array1))

	// Value, such as map, slice, array.
	fmt.Println("map1:", reflect.ValueOf(map1).Kind())
	fmt.Println("map2:", reflect.ValueOf(map2).Kind())
	fmt.Println("slice1:", reflect.ValueOf(slice1).Kind())
	fmt.Println("array1:", reflect.ValueOf(array1).Kind())

	// True/False statement inside Printf
	fmt.Printf("%v is a map? %v\n", map1, reflect.ValueOf(map1).Kind() == reflect.Map)
	fmt.Printf("%v is a map? %v\n", map2, reflect.ValueOf(map2).Kind() == reflect.Map)
	fmt.Printf("%v is a map? %v\n", slice1, reflect.ValueOf(slice1).Kind() == reflect.Map)
}

In Go, the code does exactly what it says on the page.

It’s the simplicity that makes Go awesome.

Go: Statically typed yet expressive language with a focus on concurrency.

Go strives to keep things small and beautiful.

What I would have done in Python, Java, Ruby, PHP, C, C# or C++, I’m now doing in Go.

The code must be like a piece of music.

Code less, compile quicker, execute faster.

Any of your code that you haven’t looked at for 6 or more months may as well have been written by someone else.

General guideline: accept interfaces, return structs

Go is simple but not easy.

TODO :

• MongoDB connection
• MySQL connection
• Resize Images
• Set/Get Image tags
• SQLite connection
• Postgres connection
• React frontend