DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
Refcards Trend Reports Events Over 2 million developers have joined DZone. Join Today! Thanks for visiting DZone today,
Edit Profile Manage Email Subscriptions Moderation Admin Console How to Post to DZone Article Submission Guidelines
View Profile
Sign Out
Refcards
Trend Reports
Events
Zones
Culture and Methodologies Agile Career Development Methodologies Team Management
Data Engineering AI/ML Big Data Data Databases IoT
Software Design and Architecture Cloud Architecture Containers Integration Microservices Performance Security
Coding Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Partner Zones AWS Cloud
by AWS Developer Relations
Culture and Methodologies
Agile Career Development Methodologies Team Management
Data Engineering
AI/ML Big Data Data Databases IoT
Software Design and Architecture
Cloud Architecture Containers Integration Microservices Performance Security
Coding
Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance
Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Partner Zones
AWS Cloud
by AWS Developer Relations

Trending

  • Developers Are Scaling Faster Than Ever: Here’s How Security Can Keep Up
  • RBAC With API Gateway and Open Policy Agent (OPA)
  • Tomorrow’s Cloud Today: Unpacking the Future of Cloud Computing
  • What Is TTS and How Is It Implemented in Apps?
  1. DZone
  2. Coding
  3. Languages
  4. Closure Composition in Groovy

Closure Composition in Groovy

Michael Scharhag user avatar by
Michael Scharhag
·
Apr. 09, 14 · Interview
Like (0)
Save
Tweet
Share
7.87K Views

Join the DZone community and get the full member experience.

Join For Free

This is a short blog post about a feature of Groovy closures I discovered a few days ago: Closure Composition.

With Closure Composition we can chain closure calls within a single closure.

Assume we have the following three closures:

def square = { it * it }
def plusOne = { it + 1 }
def half = { it / 2 }

Now we can combine those closures using the << or >> operators:

def c = half >> plusOne >> square

If we now call c() first half() will be called. The return value of half() will then be passed toplusOne(). At last square() will be called with the return value of plusOne().

println c(10) // (10 / 2 + 1)² -> 36

We can reverse the call order by using the << operator instead of >>

def c = half << plusOne << square

Now square() will be called before plusOne(). half() will be called last.

println c(10) // (10² + 1) / 2 -> 50.5


Groovy (programming language)

Published at DZone with permission of Michael Scharhag, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

Trending

  • Developers Are Scaling Faster Than Ever: Here’s How Security Can Keep Up
  • RBAC With API Gateway and Open Policy Agent (OPA)
  • Tomorrow’s Cloud Today: Unpacking the Future of Cloud Computing
  • What Is TTS and How Is It Implemented in Apps?

Comments

Partner Resources

X

ABOUT US

  • About DZone
  • Send feedback
  • Careers
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 600 Park Offices Drive
  • Suite 300
  • Durham, NC 27709
  • support@dzone.com

Let's be friends: