yukeehan

list = {
  name: 'yukee'
}
// ES5
this.state = {
  list: list,
};

// ES6
this.state = {

yukeehan

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';

ReactDOM.render(
  <App />,
  document.getElementById('root')
);

yukeehan

// remove index-1 position component of array without modify the origin array
list = [1, 2, 3, 4, 5]
const removeCounter = (list, index) => {
  return [
    ...list.slice(0, index),
    ...list.slice(index + 1)
  ];
}
removerCounter(list, 3); //[1, 2, 4, 5];

yukeehan

const createStore = (reducer) => {
  let state;
  let listeners = []; // an array of listeners

  const getState = () => state;

  const dispatch = (action) => {
    state = reducer(state, action);
    listeners.forEach(listener => listener()); // to notify every change listener by calling it
  };

yukeehan

// pipe function: A pipe function takes an n sequence of operations; in which each operation takes an argument; 
// process it; and gives the processed output as an input for the next operation in the sequence. The result of a 
// pipe function is a function that is a bundled up version of the sequence of operations.
//======= two functions in pipe function =========
const pipe = (op1, op2) => {
  return (arg) => {
   const result1 = op1(arg);
   return op2(result1);
  }
}

yukeehan

/* let dog = {
  sound: 'woof',
  talk: function(){
    console.log(this.sound);
  }
}

const Talk = dog.talk.bind(dog);
Talk(); */

yukeehan

var express = require("express"),
    mongoose = require("mongoose"),
    bodyParser = require("body-parser"),
    User = require("./models/user"),
    passport = require("passport"),
    LocalStrategy = require("passport-local"),
    passportLocalMongoose = require("passport-local-mongoose");
    
mongoose.connect("mongodb://localhost:27017/auth_demo_app", { useNewUrlParser: true });    
var app = express();

yukeehan

var mongoose = require("mongoose");

mongoose.connect("mongodb://localhost:27017/blog_demo", { useNewUrlParser: true });
// POST - title, content
var postSchema = new mongoose.Schema({
    title: String,
    content: String
});

var Post = mongoose.model("Post", postSchema);

yukeehan

#main_container{
    margin-top: 7.0em;
}
#delete{
    display: inline;
}

yukeehan

var mongoose = require("mongoose");
mongoose.connect("mongodb://localhost/food_app");

var foodSchema = new mongoose.Schema({
    name: String,
    taste: String,
    isGood: Boolean,
    price: Number
});