JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
Input:
<input id="input" type="text" value="" />

<input type="button" value="Submit" onclick="$('#output').append('&gt; ').append($('#input').val()).append('<br/>').append(respond($('#input').val())).append('<br/>')" />

<input id="clear" type="button" value="Clear" onclick="$('#output').empty()" />

<div id="output"></div>

CSS

#output {
  margin: 10px 0 0 0;
  min-height: 100px;
  border: 1px solid #ccc;
}

JavaScript

var brain = [
	{ key: "hello",
  	value: {
  		neutral: "Hello, please say the name of a book to get a review.",
      positive: "Hello, please say the name of a book to get a review.",
      negative: "Perhaps, a good book would cheer you up. Please say the name of a book to get a review."
  	}
  },
  { key: "alice in wonderland",
  	value: {
  		neutral: "The book Alice in Wonderland has a rating of 4 stars.",
      positive: "That's great to hear that you enjoy the book. You might also like \"The Annotated Alice: The Definitive Edition\" by the same author, with a rating of 4.5. Would you like to hear about it?",
      negative: "Although this book might be dissapointing, you might enjoy \"The House at Pooh Corner\", by A.A. Milne, with a rating of 4.3. Would you like to hear about it?"
  	}
  },
  { key: "pemberley",
  	value: {
  		neutral: "The book Pemberley has a rating of 2 stars.",
      positive: "That's great to hear that you enjoy the book. You might also like \"Wild Nights\" by the same author, with a rating of 3.7.",
      negative: "Although this book has quite a low rating, you might enjoy \"Mrs Darcy's Dilemma\", by Diana Birchall, with a rating of 3.4. Would you like to hear about it?"
  	}
  },
  { key: "bye", 
  	value: {
  		neutral: "Goodbye.",
      positive: "I'm glad to have helped! Please come back soon. Goodbye.",
      negative: "I'm sorry I couldn't be of much help. Please try again, next time. Goodbye."
  	}
	},
  { key: "help",
  	value: {
  		neutral: "Please say the name of a book to get a review.",
      positive: "Awesome! Please say the name of a book to get a review.",
      negative: "Retrieving book reviews can actually be quite easy! Just say the name of a book to get a review." 
    }
  }
];

function getSentiment(input) {
	var sentiment = 'neutral';
	var positives = ["love", "happy", "great", "enjoy"];
  var negatives = ["hate", "sad", "bad", "dislike"];
  
  // Split sentence into words.
  var words = input.split(' ');
...