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Exploring Golang features Go Report Card

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

Go

Contents

Name Description
00_persisting_go Installing Go, persisting on systemd, Upstart
01_data_type type, error, recursion, reference, sort, switch, type assertion
02_mongodb_aggregate_cli aggregate data from mongodb displayed in CLI
03_mongodb_find_sort_cli MongoDB Find All, Sort commands, results in CLI
04_get_url_variable Get "FormValue" variable from URL
05_mongodb_crud_cli Insert, Update, Drop, Find, Index commands, results in CLI
06_ajax_send_receive Two Ajax examples: read and write
07_one_page_template GO code and HTML template in one file
08_gowiki Simple wiki example
09_todo_list_html Todo list with struct and HTML template.
10_mongodb Mongodb query results on HTML page in one go file.
11_socket_send_receive Send/receive text between client/server via socket.
12_mgo_pipeline Mongodb pipeline query saved in one go file
13_qr_barcode QR code generator displays PNG image in browser.
14_read_txt_file Compare ways to process TXT file
15_png_or_svg_barchart generate bar chart, PNG or SVG
16_drop_down_menu_form Form /w drop down menu, template with sub-templates
17_mysql_user_login MySQL for user registration, login, and user list.
18_cookie_authentication Authentication with cookies.
19_os_global_variables Displaying all global system variables.
20_mongodb_crud Mongodb CRUD with REST using httprouter & HTML templates
21_httprouter_template html template with httprouter and ServeFiles
22_mongodb_crud_rest_html Mongodb CRUD with REST using httprouter & HTML templates
23_file_uploader Upload file and save on server
24_calculate_time Time related features
25_https_static_files Serve HTTP and HTTPS w/ NotFound for static files
26_url_not_found_handler Custom Not Found handler.
27_mongodb_bulk_upsert Mongodb bulk insert from TXT file
28_markdown Generate Markdown using blackfriday
29_go_crud_json_api REST API using JSON with httprouter. JavaScript is used to view, create, edit, and delete records.
30_mongodb_crud_json_api REST API using JSON, httprouter, and toml, i/o to MongoDB
31_send_email Send email with attachment
32_colorful_cli Create colorful CLI
33_testing Testing package example
34_channels Buffered/unbuffered channels, forking channel, ranging over closed channel.
35_mongodb_pipeline_page One page MGO aggregation with pipeline
36_concurrency_channel Channel, waiting, concurrency, sleep, close, count, queue
37_html_template Simple html template with Go
38_url_request_JSON Convert data to/from JSON, get and parse file from URL
39_read_directory_content List files adn sub folders in a given folder
40_cron_scheduler Schedule processes
41_cli_arguments Run cli utility with options using os.Args
42_upload_many_files Upload multiple files from browser form to folder on a server.
43_resize_jpg_png_image Resize images
44_csv_file Read and write to CSV file. Parse CSV file to slice of objects.
45_image_exif_data Get image attributes for each image in a folder.
46_video_capture Capture video from web camera and display live.
47_download_slice_as_csv Download link generates CSV or Tab Delimited file that can be saved localy on your computer.
48_keyboard_driver Testing IOT devices
49_constructor Example creating new package with allocation/constructor that accepts multiple types using interface. Experimenting with Readers and Writers.
50_golf_framework A fast, simple and lightweight micro-web framework for Go
51_blur_image Blur, Rotate, and Generate Thumbnails.
52_jpg_image_watermark Add watermark to image
53_regular_expression Validation, Find and replace, security
54_rotate_image Image rotation in degrees from 1 to 360.
55_html_template_std_lib HTML template using standard library packages
56_html_formatter Work in similar fashion as go fmt, but on HTML files.
57_valid_interface Interface as parameter.
58_GO_HTML_template Go HTML template examples.
59_zip_and_unzip Example for archive/zip package.
60_http_response_as_file HTTP handler responds with a copied file.
61_logging_middleware Save logs and error logs to file or database.
62_download_progress Progress shown on CLI.
63_graphql_todo_example One file GraphQL example.
64_
65_books_example MongoDB CRUD example.
66_server_sent_events Live logs (events) from server to browser using the EventSource HTML interface.
67_stringutil Reverse a string, test included
68_iota Iota identifier is used in const declarations to simplify definitions of incrementing numbers.
69_JSON JSON input/output examples

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)
}

Go

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

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