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Design Patterns implemented in Java 8

These patterns are implemented using Java 8 Lambdas (together with Project Lombok annotations).

Factory Pattern

Factory I : No Parameter Constructor

Enum class:

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/**
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0

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import { Component, HostListener } from '@angular/core';

@Component({
  selector: 'app-keyboard-listener',
  templateUrl: './keyboard-listener.component.html',
  styleUrls: ['./keyboard-listener.component.css']
})
export class KeyboardListenerComponent {

  // Listener just for one key

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Go

Go is a statically typed, compiled programming language designed at Google. Go is syntactically similar to C, but with memory safety, garbage collection, structural typing, and CSP-style concurrency.

This cheat sheet is prepared by refering the book Introducing Go Build Reliable, Scalable Programs by Caleb Doxsey

Topics

• Single and Multi-line comments
• Basic Data Types
  • Intergers

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Go Notes

CLI

The most important Go CLIs:

Command	Description
go build	Compile packages and dependencies
go fmt	Format package sources

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Go note

my personal go note

• Go note
  • Context
    • Background
    • WithTimeout
    • WithValue
• Other usage

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package main

import (
	"encoding/json"
	"fmt"
)

type example struct {
	Name    string
	Address string

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package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	// Create a map to parse the JSON
	var data map[string]interface{}

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package main

import (
	"fmt"
	"time"
)


type Barista struct {
	name   string

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// MeshLogin logs into the mesh backend and sets the session id
func MeshLogin(username string, password string) {
	body := map[string]string{
		"username": USERNAME,
		"password": PASSWORD,
	}
	payload, _ := json.Marshal(body)
	r, _ := http.Post(BASEURL+"auth/login", "application/json", bytes.NewBuffer(payload))
	for _, cookie := range r.Cookies() {
		if cookie.Name == "mesh.session" {