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[Ruby] Manage version of Ruby itself with rbenv

less than 1 minute read

What is this? This is a memo when installing via the Version management tool when installing Ruby. Installed on Ubuntu.

[Ruby] Make a family todo list with Sinatra

less than 1 minute read

Introduction @kirinri posted Lovely article-Qiita, so try to ride it. Completion screen Devised points When you delete a user, delete Todo for that user

[Ruby] How to solve PayPal Ruby SDK SSL_connect error

2 minute read

Introduction Recently, I got an error in PayPal Ruby SDK, but the solution is that there is no Japanese information in Google search, and English is hardly ...

[Java] How to minimize Java images

6 minute read

In this article, I’ll use a Java application based on Spring Boot as an example to give you some general tips for minimizing your Java images.

[Java] Calendar related

less than 1 minute read

```java Calendar c = Calendar.getInstance(); c.add(Calendar.YEAR, -1); c.set(Calendar.HOUR_OF_DAY, 0); c.set(Calendar.MINUTE, 0); c.set(Calendar.SECOND, 0);

[Ruby] About Rails routing

5 minute read

Overview I have summarized routing in a Rails application.

[Ruby] [ruby] Drill output

less than 1 minute read

Content Writing code using the concept of classes and instances Make an addition to the above code to get the following output. However, we will use the cl...

[Java] [Java] Creating a calculator program 1

less than 1 minute read

Purpose About a month has passed since I first learned Java by myself, and I want to create a GUI application using Java, so I will create a calculator appl...

[Ruby] When reading the source code

less than 1 minute read

When you enter an existing project, you need to check what kind of method each Class has.

[Java] Sending an email using Amazon SES SMTP in Java

4 minute read

When the member forgets the login password, I wanted to send an email to the registered email address and press the link in it to reset the password, so sen...

[Ruby] Production environment and credentials.yml.enc

2 minute read

What I want to convey in this article Before dealing with confidential information in the production environment with credentials, please check. Just copy a...

[Ruby] How to implement ranking function with Rails

less than 1 minute read

Previously, I implemented the ranking function by referring to this article of Qiita (Rapid ranking function) was. I was able to implement it safely, but I ...