Learn Ruby – How To Check if A Value Exists in An Array?

In Ruby, as in other programming languages, an array is a list of items with an order within your code. Each item has its position in this list and acts as a variable: you can see which object points to a given position, and you can make it point to a different object.
You can create an array using square brackets, for example:

There is no need to create an array with all its content at once. It can be manipulated even after its creation.

After storing this initial data, the array can be changed or have its values checked. To retrieve the values stored in it, you must specify which value you want. The items in the array are numbered from left to right, starting from the first one, and this item is called the index of the array.

How to check if a value exists in an array in Ruby

The main method to perform this operation is to use the .include? method.

As the answer, you will have “true” or “false.” If you are using Ruby on Rails, there are several other ways to do this, and we’ll show you one now.


How to check if a value exists in an Array in Ruby on Rails

There is a method in? at the ActiveSupport that exists in Rails since version 3.1. So you can run this query with the code below:

Do you know other ways to do this type of check? Share it in the comments section at the end of this article!

If you want to explore other issues, can check our videos about Ruby. Below are some examples:

You can also subscribe to some channels that broadcasts in Ruby, such as the following:

samaaronRuby on Rails how to array programming livecoding.tv



Ruby on Rails how to array programming livecoding.tv JD-P



Another cool way to find out interesting things about Ruby is to access our project page!

About author

About Author Dr. Michael Jurgen Garbade is the founder of LiveEdu.TV, Kyuda, Education Ecosystem. He is future Venture Capitalist, Future Politician and always on the lookout for the Next Big Challenge. Obtained Masters in business administration and physics, and a Ph.D. in finance with professional work experience in high-paced environments at Fortune 500 companies like Amazon and General Electric. Expertize: Python, PHP, Sencha Touch & C++, SEO, Finance, Strategy & E-commerce. He speaks English and German and has worked in the US, Europe, and Asia. At Education Ecosystem he is the CEO and runs business operations.