Ruby for Sentiment Analysis in Text


Sentiment analysis, also known as opinion mining, is a natural language processing task that involves determining the sentiment or emotional tone expressed in a piece of text. Ruby can be a powerful tool for sentiment analysis using libraries and tools readily available in the Ruby ecosystem. In this guide, we'll explore the basics of performing sentiment analysis in text using Ruby.


Before you start, make sure you have the following prerequisites:

  • Basic knowledge of the Ruby programming language
  • A code editor (e.g., Visual Studio Code, Sublime Text)
  • Installation of required Ruby gems (Sentimental, TextBlob)

Step 1: Install Required Gems

To perform sentiment analysis, you'll need to install Ruby gems that provide sentiment analysis functionality. Two popular choices are "Sentimental" and "TextBlob." You can install them using the following commands:

gem install sentimental
gem install textblob

Step 2: Perform Sentiment Analysis

You can use the "Sentimental" gem to perform sentiment analysis. Here's a sample Ruby script that analyzes the sentiment of a text using "Sentimental":

require 'sentimental'
analyzer =
text = "I love this product! It's amazing."
sentiment = analyzer.get_sentiment(text)
puts "Sentiment: #{sentiment}"

"Sentimental" assigns a sentiment score (positive, negative, or neutral) to the given text based on pre-trained sentiment analysis models.

Step 3: Alternative Approach with "TextBlob"

An alternative to "Sentimental" is "TextBlob," a popular NLP library for Python. You can use "TextBlob" in Ruby using the "textblob" gem. Here's a sample Ruby script:

require 'textblob'
text = "I'm not sure if I like this movie."
blob =
sentiment = blob.sentiment
puts "Sentiment: #{sentiment.polarity}"
puts "Subjectivity: #{sentiment.subjectivity}"

"TextBlob" provides both sentiment polarity and subjectivity scores, offering a more detailed sentiment analysis.


Ruby, with the help of libraries like "Sentimental" and "TextBlob," can be used effectively for sentiment analysis in text. This is a valuable tool for understanding public opinion, customer feedback, and social media sentiment.

By incorporating sentiment analysis into your Ruby projects, you can gain insights into text data that can be used for various applications, such as brand monitoring, content recommendation, and customer service analysis.

Enjoy harnessing the power of Ruby for sentiment analysis in text!