Sentiment Analysis in Jane Eyre

This is an interesting data analysis of sentiment in Jane Eyre published on Medium's Analytics Vydhia:

[Sentiment analysis] is a computational way of measuring the general sentiment of a text.
As for tidytext, it serves as a means of performing sentiment analysis. It orders text into a structure where each variable is a column, and each observation forms a row. (...)
I studied Jane Eyre for the ‘A’ Level English Paper 2 years ago. It was the longest book my teacher had set for us at over 350 pages, and I dreaded reading it. But I buckled down to read it one weekend, and instantly Lowood School and Thornfield Manor came alive. In short, I fell in love with Jane Eyre. So, what better text to do sentiment analysis on, right?  (...)
For me, what was interesting was seeing how accurate the sentiment analysis was. The Lowood school experience, for the first 10 chapters of Jane Eyre, is actually reflected in the graph at the beginning with almostno positive sentiment at all. (Jen Chik)