shan-shaji

// Liskov substitution principle
void main() {
  PayPalProcessor payPalProcessor = PayPalProcessor();
  VisaPaymentProcessor visaProcessor = VisaPaymentProcessor();

  // Here the checkout function don't now which service it is using to process the payment.
  // THe underlying implementation is hidden from the checkout function.
  //
  // I can add more function to the payment processor and can extend it's functionality.
  checkout(payPalProcessor, 230);

shan-shaji

# Dart-SRP

void main() {
  ApiController apiRedisService = ApiController(cacheService: RedisService());
  ApiController apiNodeCacheService = ApiController(cacheService: NodeCacheService());

  apiRedisService.saveToCache('Hello');
  apiNodeCacheService.saveToCache('Main');
}

shan-shaji

import 'dart:io' show Directory, FileSystemEntity, Platform;
import 'package:path/path.dart' as path_lib;

/// Static helper class for determining platform's app data path.
///
/// Does not require [AppData] to work, can be standalone.
/// Paths for MacOS and Linux were choosen based on popular
/// StackOverflow answers. Submit a PR if you believe these are
/// wrong.
class Locator {

shan-shaji

How To Work With Multiple Github Accounts on a single Machine

Let suppose I have two github accounts, https://github.com/rahul-office and https://github.com/rahul-personal. Now i want to setup my mac to easily talk to both the github accounts.

NOTE: This logic can be extended to more than two accounts also. :)

The setup can be done in 5 easy steps:

Steps:

• Step 1 : Create SSH keys for all accounts
• Step 2 : Add SSH keys to SSH Agent

shan-shaji

'use strict';

const DEF_CURRENCY = 'USD';
const DEF_SCALE_FACTOR = 100;

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const ObjectId = Schema.ObjectId;

const MoneySchema = new Schema({

shan-shaji

import 'dart:convert';

void main() {
 String object = '{"name": "hello"}';
  print(User.createInstance(jsonDecode(object)).name);
  String name = null;
  print(name);
}