Closures

Lesson in the Ruby Roadmap · Stage 19: Concurrency

Last updated 14 September 2026

What is Closures?

A closure is a block of code that can be passed around and executed later, even after the scope in which it was originally defined has ended. It "closes over" its surrounding environment, capturing the values of variables that were in scope when the closure was created. This allows the closure to access and use those variables even when it's executed in a different context.

Study this in the interactive course See the whole Ruby roadmap

Free resources to learn Closures

ArticleUnderstanding Ruby closures
ArticleClosures in Ruby: Blocks, Procs and Lambdas
VideoUnderstanding Ruby closures
VideoAn Introduction to Procs, Lambdas and Closures in Ruby

Closures: common questions

Can I learn Closures in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Closures in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Closures tutorial for beginners?

It is lesson 86 of 102 in the free Ruby roadmap, in stage 19, Concurrency. If you are new to Ruby, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.