Apache GroovyParker Johnson

Brad Koenen

Brief History of Java

❏ One of the most popular languages in use today

❏ At the core of Java is the Java Virtual Machine (JVM)❏ JVM’s exist for almost all popular operating systems

❏ Released in 1995❏ Before the web became a major platform for apps and business

❏ Many other languages have come along to fill the gap

❏ High performance, compiled, statically typed language

Apache Groovy

❏ Developed by James Strachan

❏ Talked about wanting to create a “groovy” new language that runs

on the JVM

❏ Wanted to address the shortcomings of Java

❏ First appeared in 2003

❏ Version 1.0 released in 2007

❏ Open source under Apache license

Apache Groovy

❏ Uses the JVM

❏ Enhancement to Java❏ Modern language syntax

❏ Compiles directly into Java code

❏ Call Java code from Groovy and vice versa

❏ Able to use almost all existing Java libraries❏ Java with less boilerplate and more power

features

A Closer Look“Powerful, optionally typed and dynamic language, with static-typing and static compilation capabilities” groovy-lang.org

❏ Powerful❏ Seamless access to almost all existing Java libraries❏ Dynamically typed

❏ Majority of type checking is done at run-time❏ Values have types, variables do not

❏ Options❏ Dynamic when you need to crank out code fast❏ Statically compiled for code that is production ready and more long term❏ Static typing also allows for easier debugging

❏ compiler errors vs. runtime errors

Goals

Web Dev

ImproveDevelopment Experience

Optional Typing Seamless

Code Examples

Cleaner CodeFlat learning curve

-Control statements

-Functions

-Inheritance

-Data types

Traditional Java CodeFor loop is more drawn out, initializing “i” variable and continuing on.

Apache Groovy CodeGroovy allows an upto method, provided the size of the loop necessary. “$” is a closure that gives the value of the current loop.

Control Statements

Functions

“It” is a keyword used to represent a single parameter.

Simple Inheritance

Data Types - Bytes to BooleanNo semicolons! SEE CONSOLE

Why not just use Java?Trade-offs

Who uses Groovy?

Netflix

Cisco

Best Buy

MasterCard

LinkedIn

Sony

Oracle

Target

Walmart

Why?

❏ Embedded Business Language (Domain-Specific Language)

❏ Netflix uses Groovy to offer various levels of filtering through Groovy scripts

❏ Mainly used in production code

❏ Existing Java libraries❏ JVM❏ Improved dev experience

Sourceshttp://groovy-lang.org/

https://detechter.com/everything-wanted-know-groovy-language/

https://www.java.com/en/

https://www.udemy.com/apache-groovy/ (Introduction)

https://www.tutorialspoint.com/groovy/

Questions?