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function quickSort(arr, start=0, end=arr.length) {
  if (start >= end) {
    return arr;
  }

  let pivot = partition(arr, start, end);
  arr = quickSort(arr, start, pivot);
  arr = quickSort(arr, pivot+1, end);
  return arr;
}

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function mergeSort(arr) {
  if (arr.length <= 1) {
    return arr;
  }

  let middle = Math.floor(arr.length/2);
  let left = mergeSort(arr.slice(0, middle));
  let right = mergeSort(arr.slice(middle));

  return merge(left, right);

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Name of your app
Bettr

Link to live static version
https://bettr-fit.now.sh

Link to repo on GitHub
https://github.com/verdi327/bettr-client

The user feedback you collected

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1) Should the client or the server take more security precautions?
The server.

What's the difference between local storage and session storage?
Session storage only exists for as long as the tab is open.  Local storage persists across multiple tabs, but not across multiple windows.

What problem does a JWT expiry time solve?
Using expiring tokens means that a malicious user cannot indefinitely act as you.  The token will eventually expire and valid user must login again.

Is a refresh endpoint protected or public?

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Thingful Client 
Interesting how context was setup.  A class was created that held all of the funtions and state updates.  The render function returns the provider wrapper child elements.

App Layout
  Login Page
  Register Page
  List Page
  Show Page
  Not Found (for all other routes)

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Create Heroku App
  -heroku create

Rename Heroku App
  -heroku apps:rename <new-name>

Create Heroku Postgres DB
  -heroku addons:create heroku-postgresql:hobby-dev

Get DB Credentials

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-- How many people work in the Sales department?

SELECT
  COUNT(e.id)
FROM
  employee e
  JOIN
  department d
  ON e.department = d.id
WHERE

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Install pg, knex, postgrator-cli
npm i pg knex
npm i postgrator-cli -D

Create Dev and Test DB for project
createdb -U <username> <project-name-dev>
createdb -U <username> <project-name-test>

Create Postgrator-cli config file
require('dotenv')

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DROP DATABASE if exists bookmark_app_db;
CREATE DATABASE bookmark_app_db;

\c bookmark_app_db;

DROP TABLE if exists bookmarks;
CREATE TABLE bookmarks (
  id INTEGER primary key generated by default as identity,
  title VARCHAR(100) UNIQUE NOT NULL,
  url TEXT UNIQUE NOT NULL,

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import React from 'react';
import './App.css';

function ValidationMessage(props) {
  if (!props.valid) {
    return(
      <div className='error-msg'>{props.message}</div>
    )
  }
  return null;